Well, basically the track stuff is going to cost a good bit more than the bmx stuff. Check out the old stand by, Sheldon Brown (has there been a day on this forum that his name was not mentioned?). The Bulletproof cranks seem to be good for the money. Your LBS could hook you up with a decent bottom bracket to go with them (they could probably order the cranks for you too).

I'm sure you could find some bullhorns to fit your steam. You might just want to take the headset apart and re-grease everything.

Hope that helps, good luck.