fairly recently, i purchased a fuji track bike, and i'm very happy with my new steed. I'd considered the bianchi, but there was a wait on new pistas in my size at the time, and i felt impatient. plus, i preferred the geometry of the fuji, and i like the fact that it's drilled front and back for brakes, which allows for more options for the bike down the line. (if i ever want to use, say, a freewheel or an internally geared hub in the future. not likely, but options are good.)

i didnt get a chance to look at the khs, as there arent any local dealers.

from a practical standpoint, i've yet to add a rear brake to my fuji, and i NEVER use the freewheel on the flipflop hub. so, i havent really taken advantage of the rear-brake option.

if ya wanna buy a more expensive frameset, and then build a bike around it, you'll spend more money. still, that gunnar street dog looks nice, with the 853 and massive clearance for fenders/fat tires, etc. this is no track bike; it's a very practical ss/fg commuter/all-purpose bike, and it looks to be a nice one. still, if you're gonna build the bike yourself (and buying frames from gunnar, surly, vanilla, etc will require you or your shop to do so), you might as well save some cash and get a very cool old frame with horizontal drops. imo, this is the better way to go. if you need a fixie asap, buy one of the cheaper complete bikes from bianchi, fuji, or khs. (i needed a bike asap, as mine had just been stolen, and i neednt transportation right away. no time to build up an old frame.)

anyway, just my $.02: i love my fuji track, and it's held up very well, wheelset and all. (imo, the wheelset is very nice, and i'm heavy, with no problems!) i dont see anything wrong with the bianchi or the khs, except that riding a bianchi pista 'round here is likely to get you heckled by the cyclo-snobs(but not by me.)

hth,
-rob