What would be the best pump/rad for mineral oil pc

Thanks for the info guys, jlan86 i'm not sure you read the whole post as i've already built and been using the pc, ssd included and everything runs fine (pic included), but your post was an interesting read anyway
If i do this again, i will def consider keeping the psu out the oil as you suggest, but only because if its producing a lot of the heat this will make the whole system easier to cool.
After 3 hours, the cpu, gpu and the oil itself (which is the big concern) all hit around 55c within a few degrees of each other, so this system def needs to be cooled and quite drastically as its only supported by 2mm perspex.
So, funds withstanding, at some point i'm going to need to drop a pump in it, with some 1/2" tubing leading to a rad outside the case - but what these need to be in order to cool 12litres (2 1/2 Gallons) of hot oil seems to be anyone's guess. I'll just keep on searching for now tho.

Thanks again for the info, i've checked out the pumps, however, Buzz247, as you can probably guess, your answer for the rads wasn't what i was hoping to hear lol. A MO-ra3!!!, jeez that beast would dwarf the system i've built, - "otherwise 2 quads in a push/pull config". - 16 Fans!!!!!
I've always had my heart set on the 'Phobya xtreme quad 480' and was gonna try that with 4 low rpm fans, remember, i only want the oil to stay within a reasonable temp, not overclock any hardware, however, as you've already done all this before i'm gonna have to seriously re-think my plans before i go shelling out any cash, or just bite the bullet, cross my fingers and go with my original instinct.

Could i just ask one more question, you mentioned that the amount of liquid to cool has no impact on the rad size, someone else also mentioned something to me along the same lines, so, - if it takes, for example, a Mo-ra3 with 9 fans to succesfully cool 20 gallons of oil, will it still take a MO-ra and 9 fans to cool, say, 5 gallons of oil, if everything else remains equal?
It's just that it seems counter-intuitive if you know what i mean, but as i'm beyond hopeless at physics i'm at the mercy of others here.

The thing is, i specifically built this system small, 25cm, so that it wouldn't take too much to cool as oppose to buying a massive fish tank and putting everything in there. I still have a regular dry-pc, so its not life or death that this can go past it's current 3hr mark, but being able to do so relatively cheaply is my main goal.

note - i know the psu cable shouldn't be in the oil 'cause of wicking, i just havent got round to attaching it to the aluminium plate yet, tidying up the cables and a few other tweaks, but it works fine for now, till i feel less lazy.
Once again, all help is fully read and appreciated, thanks

Ok here's an update for anyone googling this as there's literally no solid info on cooling a mineral oil pc.

First off the pump i used was a 'Phobya DC12-400' this is just a rebranded version of the EK DCP 4.0, it flows through a triple rad and 2 metres of 1/2" ID tubing. It was easy to prime and the oil has to climb 45cm vertical from the outlet to the rad, which is far more than a regular water loop. Infact as mineral oil heats the viscocity drops and when the oil hit 50'c the flow was so strong it shot the end of the tubing off the outlet (i used barbs but no clamp figuring it wouldn't hurt if it came off) no problem, but it did make me jump so i've forked out 2 quid for a clamp

As for the rad, i went for the 'Aquacomputer airplex revolution' triple rad, with three cheap 120mm fans. 2 fans are running at 600rpm and one at 1350rpm. This setup cools the pc so well, i discovered an unexpected bonus, the option to overclock.

So, from a dual core phenom ii x2, i unlocked the 2 hidden cores and oc'd from 3.2 to 3.6, increased voltage to 1.45v This might seem like a modest oc, but remember its gone from a 3.2 dual core to a 3.6 quad, the extra heat is significant. I ran prime 95 using small fft's for 12 hours and the cpu temp was 46c, the oil which was always my big concern was 36c.
The GPU is a HD7750, oc from core clock 800mhz to 920mhz and 1125mhz to 1250mhz, thats a 15% oc on the core alone, i ran furmark for 4 hours and gpu temp was 56c and the oil 33c.

Under full load from regular usage even after several hours i've never seen the oil go over 30c.

The setup works like this -

regular custom loop
pump - rad - reservoir - cpu & gpu waterblocks

mineral oil loop
pump - rad - the pc itself IS the reservoir - the mineral oil is the waterblocks on cpu, gpu, mobo, ram, hard drive.

All things being equal this cost at least 30% less than a traditional loop.

So, final thoughts, am i saying that a liquid submerged pc is better than a custom water loop?
Well, no.
Am i saying that its a viable alternative? Absolutely.

Remember i still have the option to add 3 more larger 140mm fans, the oc possibilities are huge. and all this from one triple rad with three cheap fans 2 of which are inaudible to the human ear. The whole system is completely silent apart from the one 1350rpm fan which clearly i don't need. and when i say silent, i don't mean very, very quiet, i mean totally SILENT

yeah, tbh i know a giant mo-ra would cool it and if i win the lottery i will buy a couple, but my question was i needed something relevant for my system, no offence was meant to the guys who replied, particularly buzz for his help, but at the end of the day these were largely stabs in the dark, (he clearly states that one quad would not work) so this reply is just intended to help anyone else who can use the 4 key areas to use as a base for finding relevant cooling for their own system.
1. 25cm cubed case.
2. 12 litres of oil
3. 250w max heat output
4. triple rad (3 low rpm fans)