Thank you very much for all of your advice. I ended up buying a "Senco FinishPro 35 Angled Finish Nailer Value Pack" from Lowes for $199.99. It included the 15 gauge nailer and a "freebie" 18 gauge stapler. I used the finish nailer over the weekend on a mantle that I'm building for our new house and all I can say is WOW (and I wish I would have bought this years ago)! Unlike my 2" 18 gauge brad nailer, there was no need to worry about deflection with the 15 gauge nails. Yes, the resulting hole is a little larger, but the mantle is getting painted so there are no worries.

Anyway, thanks for all of your help!