Aaron is right. Plano doesn't have much to offer in the way of barbecue ... chains and chain wannabees mostly. Some, including me, argue that the whole Dallas area has a paucity of decent barbecue. Dallasfood.org is a good source for what there is around here; Forth Worth is really the closest source of decent 'cue.
On the other hand, if you are looking for good steak, decent Asian (not Chicago calibre, though), or passable Chettinad Indian, I can provide some ideas.