The best sanner for student need

Hey guys. I am currently in the proccess of building a portfolio, and i have an old HP Scanjet 3400C scanner. The problems is that 1. It has a step from the window to the top surface of the scanner, so my 11x17’s allways get destroyed after a scan, and second, the quality is not so great. Its more than 5 years old…

So my question is, for about 150, what can be the best scanner on the market right now? Something that is completely flat where the scanning window is, and not have the damn buttons on the front side where the lid clamps down.