For me it's the Wide Glide.  It's the only bike in the line that fits, and I rode 'em all!  I'm a taller rider, and almost any machine with mid controls puts my knees up beside the tank.  I added a Kuryakyn "Moustache Bar" for highway peg mount which is very versatile and provides me the legroom I require.  Mine is a '07, and that 6-speed is as smooth as butter, I about wet my pants the first time I drove her.  I changed the seat to provide more passenger comfort, (after all, it's all about her :s) and a mid height backrest gives a classic look in my eyes.  The mini-ape bars are real easy on the back.  Now with V&H bigshots staggered and stage 1 mods she is also my "muscle car", but that's a different topic.