I've been eyeing water cooling for a while now, but I wont do it for some time, since I'm quite happy with 2.61 with my zalman, but the temps are at 51 at load, so I won't be going any farther anytime soon.
There have been a few things about water cooling which I have concerns about though (the putting together part isn't a concern).
1. Portability.
This is a big one for me, since I like to go to lans. Seeing as I just went to a lan a few days ago, the first one for this rig, I must say that this thing is freaking heavy already. Also, since I don't have a car, I had to rely on other people and pubic transportaion, and it was not fun (the lan was but the travelling wasn't) I'm not sure if I want to add an extra a lot of pounds onto that load.
2. expensivity, or however you say it.
Soon my job will be out for the season so I'll have to scrape my 17 year old highschooler arse for money just to do stuff, I won't be able to buy stuff for a while now unless I really feel like taking that job.
I do have some knowlege that others may not have, and know a few people who are a bit more than adept at water cooling, like the fact that it is so much cheaper and more effective to go down to the hardware store and buy a 6 inch heatercore, and a 140mm fan, build yourself a simple shroud and something to hold it, than it is to do a triple 120mm rad thingy. One of my friends has said thing, and he's got his 3700+ to 3.1GHz at 33C load temps.
Another thing that would save a few dollars is a custom reservoir, made out of a square nalgene bottle. It's cheap, it's effective, and you can run it over with your car and it will not break!
3. Inside-my-case-ility
I do not want some big monstrosity hanging out of my case to ugly things up. I'd like things to be all internal, but I'm not sure if it is feasible (I do know it's possible). I have an Antec P180B, and if I take out my lower HD cage, then I can fit in a 6 inch rad quite nicely, but to fit the pump and reservoir I'm going to have to take out my upper hd cage, which isn't too big of a deal since I only have one hard drive, but I'd like to still keep it in there. There are a few limitations which I'm going to have to iron out, as well as ask you guys for some help, but I do want to build this one day.
I'm also gonna have to look at what kind of pump I'm going to want to get IE: a pump that plugs into psu, a 12v pump that plugs into wall that is/isn't connected to psu for when to turn on, a 120v external pump w/ w/o psu mod. I'm looking into which will offer the greatest benefits, compared to the expensivity and the amount of modding of my case, my powersupply and the actual pump will be.
I dunno, it was just kind of a really big ramble.