Yes, the 260 is much better but the 9800TX+ is a solid performer. Sparkle brand may leave a lot to be desired and the cooler exhausts into the case. I would opt to spend $14 more on the EVGA SC card (before $20 MIR) plus it is already OC'D.
By the naming conventions, the EVGA 55nm cards are numbered 896-P3-125x, and the 65nm cards are numbered 896-P3-126x. Also, the 65nm cards have a more orange casing, whereas the 55nm cards have a red casing. Have a look at the pics: 1255 GTX 260 and 1265 GTX 260.
Note, these are the Core 216 editions of the card, I left out the Core 192 versions, since they're all 65nm, and really aren't worth the $20 savings. YMMV, but I bought the stock speed 55nm card and haven't had any problem overclocking to the Superclocked edition speeds.
Here is a HD4870 512mb card in your price range. ($144 w/MIR) Not quite the 260 GTX 216 but close. I had the 1gb Powercolor version and the HD 4870 handles the 1680x1050 resolution and the new titles with no problems. The new 9.2 CATs seemed to work good also. http://www.newegg.com/Product/Product.aspx?Item=N82E168...