I'm currently in the stage of picking components for a new computer, and I'd appreciate it if some of you could have a look at the things I've picked, and tell me if I'm going in the right direction.

Basically, I want a computer that will run Avid Liquid (normal, not Pro) but not yet. I can't actually afford to do the whole thing at once, but I need a new computer pretty quickly. Therefore, I need the basic computer now, with the capacity to upgrade it to a video editing machine later on (two monitors, dedicated capture and storage drives, a quality sound card etc). Therefore, I've picked my components with this in mind, so here it is with rough prices.

AMD Athlon 64 (ADA3800BVBOX) X2 3800+ - £190

*Asus A8R32-MVP Deluxe SKT939 RD580 Crossfire ATX - £125

2 x Crucial 1GB DDR PC3200 400MHz - £56 each

2 x Samsung SpinPoint P120S 250GB (RAID 0 setup - just to have a go at it) - £55 each

Club3D Radeon X1300Pro 256MB DDR2 PCI-Express, DUAL DVI-I, HDTV Out - £55

*LiteOn 16H5S Lightscribe Kit retail - £30

Microsoft OEM Windows XP Professional x64 - £90

Plus a decent case (recommendations welcome)

The things with a * next to them are things that seem to do everything I want, but that I don't know a great deal about and haven't put a lot of effort into finding alternatives.

Thanks in advance for any help.

ETA: I've just looked at the system requirements for Avid, and they mention that it requires an AGP Graphics Card, whereas the one I've picked is PCI-E. Is this an issue?