Busness class sgould be ok, check the stats on it to see what the upload is, I know with Road Runner the first tier of Bizness class has less upload as residental,

(2 Mb/s download) (300Kbps upload) for residental



(1 Mbps Download) (256 Kbps upload) for tier 1 busness class.

so saying you have busness class = better, isnt normaly true