It really depends on the quality you want. For $75 to $100 dollars/scan, a TRUE pro lab will do a "drum scan," where the negative or transparency is immersed in an oil and scanned. It is the highest quality currently available for exhibition, museum, reproductions etc. Once it's scanned, you print from the CD or disc as many times as you want.

However, for general use, Epson makes some of the best. I own the 1640SU which handels film up to 4x5 and prints to 8x10. Anything larger you have to split the image, do two scans. Then put the halves together in photoshop. I use it only to scan for my web site but it will produce decent quality for an amateur. If you really want to spend $2000.00, try Calumet Photo. They have a good line of high end flat bed scanners or they can direct you else where.