I'd wait until fall for when when the Kilo TT Pro restocks, and pick one of those up. They are $450, and the $50 gets you quite a bit over the standard Kilo TT. It gets you a much better wheelset, with sealed bearings, and it also gets you a $110~ crankset, as well as a pretty bangin paint job. Then you can spend your remaining 50+ budget to upgrade what you feel. saddle, pedals, etc.
You could even take the nice set of brakes they give you, and put them up on CL to make 50 bucks back to put towards more upgrades.