FCPX 10.0.3 will not work with my Mac Pro ???

Here are my specs:

ATI Radeon HD 2600 XT:

Chipset Model: ATI Radeon HD 2600

Type: GPU

Bus: PCIe

Slot: Slot-1

PCIe Lane Width: x16

VRAM (Total): 256 MB

Vendor: ATI (0x1002)

Device ID: 0x9588

Revision ID: 0x0000

ROM Revision: 113-B1480A-252

EFI Driver Version: 01.00.252

Running: OS 10.6.8

and I can't run FCPX. Message says: Graphics configuration not supported

End of story !

Apple guy (Steven) told me to buy a new computer ! WHAT THE F....!

When I asked if I could simply change the graphic card, he said maybe

Where is Steve, now that we need him...

So what gives ? New card (but choice is rather limited: http://support.apple.com/kb/HT4728?viewlocale=en_US) and if so which one cause none on this list seems to be available anywhere

or new computer ? ouch !

or good old FC 7 ?

btw previous FTP 10.1 is working fine but according to Steven, it's only because Apple made a mistake and that it should have never worked in the first place. There was a problem with graphic card recognition in v.10. All fixed now so nothing works ! (what a fix...)