I agree with David,
Best waterblocks are Maze 2 units from
www.dangerden.com.
For rads check out the Big Momma (best cooling) from
www.caseetc.com or the aquacoil (if you need something easier to mount) from
www.aquastealth.com. Both these units are available in 1/2" size, which will enhance performance, and are full copper to avoid corrosion.
For pumps again
www.dangerden.com has premium Eheim units (the 1250 is awesome, very quiet and reliable) or check
www.aquastealth.com for the Mag-Drive 250gph (also quiet and reliable). Your local fish or hydroponics store probably has the Mag-Drive 350 or 500.
Tubing and brass fittings, I use Home Depot Braided PVC (it won't collapse as easy as clear vinyl) in 1/2", and brass barbs for the pump and T. You can also get electrical boxes for resevoirs here (if you feel you want one).