even if your bars are at the right height, your neck can still get sore (mine did) when you first start riding. as for your saddle, if you are riding it daily and you still feel like your saddle sucks after a couple weeks, it's probably the saddle and not your ass, get a new one. saddles are very individual, so don't look for a "better" one so much as a different one (more padding, slimmer, etc)

i also recommend a brake.

how old are you? when i've been in alb. (went to school in lubbock) i noticed a WHOLE lot of hipster high schoolers. don't get sucked in!