Don't be concerend about that because 32s only add about 50gms to the 30" gun. Ed's point is that your physique isn't relevant when choosing barrel length, although there is an oft repeated myth that smaller people should shoot shorter guns.I was going to get a 30" but Brierley recommended a 32". I'm just concerned I'm going to be overgunned as I'm not the most burley!
Personally I find a 32" Beretta much more lively than a 28" Browning, and everything just seems clearer and simpler looking down a 32" barrel after years with 30s.
I'd recommend at least handling both and if possible shooting them before deciding.
p.s. I'm with Salopian on the porting thing.