Budget gaming computer build-- need double-checking!

After research and consultation, I've put together a budget gaming computer (and it comes out to about $600, more than I wanted but less than I feared). I'd appreciate it if component-knowledgeable folks could take a glance at this and double-check my compatibilities; I think everything should work together, but I want to make certain that I haven't overlooked anything in my ignorance:

Case: Cooler Master Centurion 5 (already bought, so not changing)

new case fan (to replace the stock 80mm intake; should I get another to replace the stock 120mm exhaust?)

Asus M2A MVP

AMD Athlon 64 X2 4600+ Windsor 2.4GHz

2x1G RAM

Sapphire Radeon HD 2600XT

Corsair 450W PSU-- I have an IDE drive that I'll be putting in this machine, so I guess I have to find a converter cable?

Western Digital Caviar SE 160 GB SATA hard drive

DVD-ROM--OEM, so will I need a separate SATA connection cable?

I'll be installing Windows XP on the thing, and using it for comparatively light gaming (WoW, LotR Online, a bunch of older stuff [Baldur's Gate, Diablo II, Icewind Dale, etc.], and maybe NWN2).

Thanks for the input!

The x1950pro is out of my price range, unfortunately, unless there's somewhere that has them cheaper than Newegg-- I'm having to stick with cards that are ~$100 or less.

That's what I figured . . . my motherboard seems to have one sata cable included, so I went ahead and ordered another. Even if it turns out to be extra, it probably doesn't hurt to have another on hand. And Newegg is a hell of a lot cheaper than Best Buy for little things like this . . .

I agree with jay2tall, if you going to install XP, there is no need to have a card that is DX10 compatible when you can have a card that is more powerful for just $35 more.