PSU question

[Gunther]

Looking to upgrade my PSU, which one would be the best, future proof

Thermaltake Toughpower 750W
Coolermaster 550W
Zalmann 600 W
Enermax

Regarding that i'm going to upgrade in near future to GF8800GTS 640 and Q6600 OC

Is thermaltake a good reliable manufacturer of PSU's?

Any advice would be appreciated

 

[Gunther]

Would go for Corsair, but can't seem to find this where i'm at the moment. At the moment i'm in Thailand so unfortunatly i can't order from OCUK.
for comments on the quality of the PSU's above mentioned. Max 750 w should go for about a year or 2 no??