The Antec 900 is very popular with gamers. The case is often recommended by veteran posters at this forum. I haven't seen actual sales figures but from what I read I think the Antec 900 is one of the most popular cases.
Your 260 should fit in, though it may be a little tight. You might not want to have it sit directly across from an installed hard drive--though with the twin cages, I don't think you'll run into any issues