for the psu, i'd prob go for the antec. the gpu cooler, the only real reason i'd see buying that cooler is if you want to eliminate noise from your system since the stock 9800 cooler does its job fine if you don't plan on overclocking.
with that said, you're gonna want to overclock, trust me, i just upgraded my system last week and said i'd probably leave it alone but i decided to test to see if the cpu could go higher and it did so i left it