alright so i'm building a new bike and i'm ordering a buttload of parts tonite. i'm going sram 8 speed for the drivetrain cause i'm sick of shimano and breaking chains but i have one question. should i get a 11-34 tooth cassette or a 11-28? i ride mostly urban and dj's and i can't remember the last time i used my lower gears. am i going to regret this? should i go for the 34 tooth?