well, for 300 bucks your only going to get so much.

everything that flatlandfuel sells is quality. they don't sell crap.

I would just pick what you want from their site and buy it.
one bike may have better wheels but then the cranks are kinda crappy compared to something else.
for 300 your only going to get so much so just pick the bike that looks neat or cool to you and get it.
the more you ride it the more you will start to understand what it is that you like and want.