Here's some good advice - stick to the DC (12v) pump.
They use a tiny amount of energy, are directly connected to the PSU so they turn on when the computer turns on and they are plenty powerful enough.
That being said, cooling the CPU and GPU:
Pump:
Swiftech MCP655 12v DC Pump ($77)
http://www.sidewindercomputers.com/swmc12vdcpu.html
Sooo quiet and yet, so powerful. 317gph, 12v standard 4-pin molex connector to your PSU
CPU waterblock:
Swiftech STORM Rev 2 ($80)
http://www.sidewindercomputers.com/swstunhipebl.html
The top of the line CPU waterblock
OR
Swiftech Apogee Extreme Performance block with AM2 Support ($46)
http://www.sidewindercomputers.com/swapexpebl.html
Effective water block with low flow resitant characteristics
GPU Waterblock:
Acetal MAZE4 GPU ($45)
http://www.dangerdenstore.com/product.php?productid=150&cat=48&page=1
Low restrictive properties to waterflow.
Swiftech MC14 VGA Forged Copper BGA Ramsinks ($17)
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=196&products_id=3811
For videoram
Reservoirs:
Danger Den Single 5 1/4" Bay Reservoir ($30)
http://www.dangerdenstore.com/product.php?productid=52&cat=27&page=1
PrimoChill - Single Floppy Bay Reservoir ($10)
http://www.voyeurmods.com/index.php?action=item&id=1697&prevaction=category&previd=2&prevstart=0
Cyclone 120 External mounted ($33)
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=318&products_id=20585
Radiators:
Dual 120mm
Black Ice Xtreme II Radiator ($43)
http://www.dangerdenstore.com/product.php?productid=2&cat=85&page=1
PrimoChill Black Ice XtremePro 2 Shroud ($12)
http://www.voyeurmods.com/index.php?action=item&id=1059&prevaction=category&previd=2&prevstart=0
TO help sela off the gaps between the rad & fan to focus air direction
Radbox Assembly ($20)
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=200&products_id=1956
Don't worry about using the PCI pass-thru that comes with it.
Tubing:
Tygon 1/2in. ID 11/16in. OD Laboratory Tubing #R3603 ($2.25/ft)
http://www.sidewindercomputers.com/ty1idx11odx3.html
Get, at least, ten feet. Best tubing around and you won't find it cheaper anywhere else
Clamps:
Breeze Miniature Hose Clamp 7/16 in. to 25/32 in. (10/#3.60)
http://www.sidewindercomputers.com/brmihocl7int.html
to secure the tubing to the fittings
get 20
Kinks:
Swiftech Coolsleeves 625 ($2.60)
http://www.sidewindercomputers.com/swco625.html
helps protect tubing from kinking in tight bends
get 2
Coolant:
Regular
HydrX Extreme-Duty UV Coolant ($3.29)
http://www.sidewindercomputers.com/hyexduco.html
UV Reactive, biological preventative - must mix with distilled water
get 2
OR
Non-conductive
PrimoChill ICE 32oz ($20)
http://www.performance-pcs.com/catalog/index.php?main_page=product_info&cPath=303&products_id=3982
lubricant, non-conductive, corrosive inhibitant, non-toxic, biodegradeable, biological preventative
get 2
You'll need to get your own fans for the rad. This is a guideline mind you. It isn't set in stone but is a list that will give you a top-of-the-line cooling loop. Substitutions can be made for various parts though so see how it fits into your budget and adjustments will be made where needed