Don't hate on someone because they prefer something to you.
Buy if you're insistent on watching the dubbed version and funimation doesn't work for you, then your next best bet is probably checking out Crunchyroll, but I'm not sure if they have the dub or even air One piece. Still, I think it's your next best bet. Either that, or just buy the DVDs yourself and watch it like that.
Seriously, what is the point of all these posts about comparing the subbed version with the dubbed version? All the OP is asking is for a site which shows One Piece with the dub, because that's what he prefers. Not about if the sub is better than the dub.