Upgrade PSU??

[Prox7]

I'm upgrading to GTX280 from 8800GT. I currently have a Silverstone Strider SST-ST75F and the system listed below. These PSU only has 6 pins plugs PCI-E and no 8 pins PCI-E plugs. Could I use an adapter or do I need to upgrade? If i need to upgrade what should I get budget @ $150?

Q9550 CPU
6GB ram, 800mhz
5x HDD
1x 74GB Raptor
1x 150GB Raptor
1x 250GB SATA WD
1x 640GB SATA WD
1x 250GB EIDE WD
2x DVDRW
Audigy Extreme Music (PCI)
Antec 900
3x 120mm Fans
1x 200mm Fan

 

[Dangman]

Use an molex to 8Pin PCI-E connector adapter which most GTX 260 cards come with and keep the PSU. It'll be fine for that setup

 

[Prox7]

Sorry corrected. I'm getting a GTX280 not a GTX260.

 

[Zero82z]

Same thing should still apply. Just use an adapter.