I use the Epson V37, it has worked out fantastically for me. I think the money you spend on a scanner is almost always worth it.
The most important thing is to make sure your scanner has a CCD lens instead of a CIS. As I outline in this thread, only CCD lens scanners will scan PSA cards with a high quality. As most newer models have a CIS lens, you should do research and only buy ones you’re sure have CCD lenses.