I did replace my 260 with a 460. The differences were minor but I'm able to use a lot more smooth shading than I was with the 260. I had originally bought it to make sure my video card wasn't dying when I was investigating the CTD bug, but I fell in love with the 460 and kept it.
I'm happy Airflyer is happy with the 260, it really is a great card. If the card ever fails, let me know and I'll be the go between so you can keep the lifetime warranty.