I'm 6'2" 220 lbs... and like little bikes. Little for me is anything smaller than a 1500 Drifter.
I like the extra leverage from running the apes. And the sail effect transfers a bit more weight off the front end.... ;D
All kidding aside, I've never had problems with a 19 or 21 inch front wheel, 15 or 16 inch rear and 12-16 inch rise apes. All of my crashes have been with stock or lower bars and equal sized front and rear tires.
I'll try and put up a picture of "Pokey", should be one or two on the confuser still.