With Nvidia cards, the second number in their model number is usually more important than the first (e.g., you're better off with a 7800 than an 8400). As such, you can usually find bargains amongst older generation high-end cards, which will outperform newer generation budget cards while being comparably priced or cheaper. Never buy an Nvidia card with a second digit lower than "6" if you intend to run heavy 3D applications (which SL clearly is), unless you have no choice.