[Andy]

My suggestions:

Pump: Ehiem 1048 or the 1250. The 1048 moves 600L/min at 1.5m head while the 1250 moves 1200L/m at 2m head

WB: The White Water is a nice block, however the WW was designed to cool the athlon XP core and the IHS on the P4 may hamper the cooling ability of the WB. With that said, I can't really recommend you a WB for a P4 as i only really concentrated on finding what was best for my athlon

Rad: Your choice here really, I've got a Black Ice eXtreme (aka BIX) and have no complaints except for the fragile paint job. If it can fit, get a rad that fits 12 cm fans

Fans: Your personal choice again, I've got 2 adjustable enermax 12cm fans, one blowing air throught, the other suck air through

Res: I personally wouldn't bother with one

Tubing: Tygon is nice, but expensive, If tygon is too expnsive for you, have a look at clearflex 60