im sure dano will be along at some point as he's a bit of a veteran in watercooling, but you are stuck with me for now.
I watercooled my first pc last 1.5 years ago and done so nearly entierly using my own common sense and google, though i had a few recommendations from people on here.
I got most of my equipment from www.coolercases.co.uk but when i was building my rig i found that no 1 site had all the bits i needed, so i had to get a few bits from other sites like chilledpc.co.uk, watercoolinguk.co.uk etc (you can easily find plenty in the uk with google)
I cant really recommend any specific parts as most of what i bought will no longer be current so you may have to do some reasearch on brands that are current, quite alot of my setup was danger den, which ive had no issues with and they are extremely high quality, however they don't seem to be stocked in the uk as much as they used to. A quick google reveals getting a block for your GTS may be tricky, but it was only a very quick look.
Though i WILL recommend Thermochill Radiators (http://www.thermochill.com/) they are excellent, built here in the uk, the states go nuts for them.
As far as acctually building the system, easy peasy, i acctually had fun doing it, just do a little bit of planning, i have mine set up as follows - pump > reservoir > radiator > CPU > GPU > pump - which keeps my temps nice and low, about 25C on idle and peaks about 35C when under load or rendering.
Theres are some good guides which can be found through google, which are a few years out of date but the principle stays exactly the same.
The list of my watercooling equipment is below if it helps at all.
I'm no expert but if you have any specific questions i would be happy to try help you out buddy.
Danger Den TDX Intel 775 CPU Block
Danger Den Tyee Crossfire Prepped GPU block
Danger Den Single 5 1/4" Bay Reservoir
Danger Den Fillport (Delrin)
Laing DDC-1T Pro 10watt Pump with Plexi Top
Danger Den 1/2" ClearFlex 60 Tubing (10m)
Thermochill p120.2 radiator with grille mounting plate.