Actually, I've already beaten HL2, over a year ago, on the Radeon 9250. It's just now, I can run it in style.
I already have the card. In fact, I now have the motherboard, the processor, the RAM, the hard drive, the sound card, the monitor, the speakers, the mouse, the keyboard, the DVD+/-R drive, and the floppy/USB drive. What I don't have is the PSU or case to put it all in, so it's all just sitting in my room (bar the monitor, speakers, keyboard, mouse, and sound card, since they're all being used by my current computer instead). The other two parts come today, though, so I can start building tonight (albeit at 9PM) or tomorrow...