I've looked on this forum for a sticky on purchasing, and have come up empty. I'm a bassist and I'm looking for a nice, simple keyboard to start learning on. I just need something simple and relatively inexpensive. 88 keys, not needed. What models would suit me best? Target had one for like $126, but I'm not sure if I found one used for maybe $100 more, that I'd get a way nicer unit. I have no idea. Help!