since you have been around bmx you should easily be able to up a roadie.
$150 wont get you anything near "high end" even if its 20+ years old.
Also, your going to want to mod/set it up for you i would think..
Your prefered pedal setup(go clipless and you'll never go back!)
just some basics you'll want to switch up/ or will be replacing most likely within your first couple months if you really get into it!
here's my city beater