crib help

First time mom and looking for a crib. I've been doing research to find a crib I like. I want to get a convertible one. I swear every time  I think I found a good one reviews are not the best. Any suggestions would be awesome. Not looking to spend a fortune. Maybe 300 tops not including mattress. Suggestions on a maggeress would also be great. I'm stressing over this with only a few weeks left.