I can recommend the Epson Perfection 4990 as I use it to scan 35mm slides and negs, 2.25 x 2.25 negatives and 4 x 5 negatives. Supplied film holders work great and features such as DigitalIce4 make for clean scans. Priced at just over your budget at NewEgg.com
http://www.newegg.com/Product/Product.asp?Item=N82E16838110122 Review:http://www.pcmag.com/article2/0,1895,1865032,00.asp

I hear that the CanonScan 9950F is also very good with many of the same capabilities as the Epson 4490. Under your budget max at: