Join Date: Aug 2011
Year/Make/Model: 2014 Kawasaki Vulcan Vaquero ABS SE
Color: Orange SE
+1 to what Whiting said.
The big three will give you a sizeable bump, but there's only so much 903 cc's will do for ya in a V-Twin with single overhead cams. I know you said it'd be difficult, but I usually tell people that if they think the 900 is seriously lacking, then the big three won't likely satisfy them. It's probably best to just cut your losses and move on to a 1700 or even a V2K (a V2K is a great bike to move to from a 900 because the frames and the riding position is very, very similar. A V2K is, pretty much, a VN900 with a hotrod motor).
BUT, if you're the kind of person who likes the 900, but thinks a little bump in power would be nice, then the big three is the way to go. Just be aware that the cost of the big three, combined with what your bike is worth, COULD get you a used V2K here in the states.
That said, I really enjoy my 900, and would honestly rather have a 900 with the big three than a V2K (I like the low weight and nimbleness). The only exception was if there was a full dresser V2K (like a V2K voyager with stereo with handlebar controls, storage, fairing, etc.)
"8 But God demonstrates his own love for us in this: While we were still sinners, Christ died for us."
Romans 5:8 (NIV)
2014 Kawasaki Vulcan 1700 Vaquero ABS SE
iPod Connector Kit, Kuryakyn Highway Pegs, Mustang Touring Seat, Marvella's Hitch, Kuryakyn Trailer Wiring Kit, Haul-Master Tag-a-Long Cargo Trailer
2011 Honda Shadow Aero 750 (Wife's)
Memphis shades quick-release windshield, OEM Solo Seat, Mustang Fender Bib, Chrome Solo Luggage Rack
Past: 2006 Vulcan 900 Classic LT