I recently got back into piano but have been playing on a 61-key unweighted keyboard, and it's really no use. I'm debating whether I should save for a used upright or an 88-key weighted keyboard. I live in an apartment and I'm worried about noise if I get an upright, so that's only a faint possibility. Are there good keyboards out there that won't affect my technique terribly? I can play at times in the college practice rooms to make sure I'm not picking up weird habits. I really know nothing about keyboards, so does anyone have any recommendations? The limit for my budget is around $500. Thanks!