Boy your cutting it close at $250. Here is a just stuff I have posted to help folks just like you. Random, but a lotta stuff. Please, it's not best buy store, you gotta know what your doing before you leap..
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Us guys have done the WC thing, there are basics you gotta know. Take a look, don't take it as a diss on you or a rebuttal, look at as a friend saying "Dude, you gotta know what to say and how to communicate".
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CPU HS $65
GPU HS and air HS for vram and mosfets $95
Radiator $60 min, up to $130
Pump $80
Resiviour $25
Hose, some barbs and clamps etc (min $25, more like $35)
I went top notch and spent close to $600 to cool my CPU and GPU.
First you gotta learn about WC. It's not like walking into Best Buy.
Spend a while (weeks is best for your sanity) at these links.
Look at the hundreds of loops close to your case and components in the stickies, read a couple 50 or so threads over the next week or so, you'll be on the ball to make the right choices and by then know how to put it together.
Not 'Roket Sience', but basic knowledge is required.
And you should spend a few hours on this site reading threads. It's how we learn. Once the goodies show up on your doorstep your on your own.
For your benefit please spend a few days reading a LOT. At the busiest places for WC masters. Guys who have done it for YEARS at OC forums and xtreme forums. It took me a while (I was OCing on air, aftermarket stuff, bios settings, best chipsets etc etc) to learn the language and the tricks to a easy install.
Don't expect miracles or SUPER DOOPER over clocks. What you will get is a quiet system that can handle OC to the max of your hardware IF you buy quality and buy smart. And minor maintenance too, a bonus for the water cooler.
Also while there please read on case mods etc. The radiators are not for small cases, pumps and hose routing, wire management and other things are important. Google your planned case and the word water-cooled in one line. You might get lucky.
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Edit: The next paragraph was from 2008. With the advent of the HOT i7 and bigger GPU's, it has changed. A 220 size MIN for an i7, you want big overclocks, better go 320 sized rad.
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IF you just cool your CPU and your NB if you want, you can get by with a 120.2 sized radiator (RAD). And MAYBE fit in inside depending on your mod skillz. You want to cool your GPU too, you'll need a 120.3 sized rad, and it probably won't fit inside. The rear external rad really works great. No matter what your adding 15lbs to your PC, maybe 20lbs.
Once you got an idea of what is good/bad then start getting your system for WC put together and we'll be glad to help.
http://www.xtremesystems.org/forums/index.php? Not a noob site, but great stickies
http://www.ocforums.com/ My fav, good peeps, know their stuff, less hardcore
http://www.skinneelabs.com/MartinsLiquidLab/
http://www.over-clock.com/ivb/inde [...] opic=20277 A GREAT Europe site
http://www.overclock.net/water-cooling/
http://translate.google.com/transl [...] n&ie=UTF-8 Info on rad testing
http://skinneelabs.com/
http://forums.extremeoverclocking.com/showthread.php?t=282232
Stores
http://www.dangerden.com/index.php [...] e&Itemid=1
http://www.petrastechshop.com/
http://www.sidewindercomputers.com/
http://www.jab-tech.com/
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