I have changed my exhaust to true duals and also installed a K & N air filter. Now I have to get a fuel management system installed. As far as the best quality and lowest price go should I install the Vance and Hines fuel pak, the Screamin Eagle Race Tuner or a power commander

There is an excellent resource for this type of thing. There is a usenet group called rec.motorcycles.harley where you can ask this question and get a ton of opinions. Go to Discussions - rec.motorcycles.harley | Google Groups (http://groups.google.com/group/rec.motorcycles.harley/topics?hl=en&lnk)

Read it for awhile. Do a Google search within the group for more info. Go to r.m.h FAQ v3.9 (http://www.rmhfaq.com) to see what the group is about. If you still want to ask your question, make sure you do an intro and buy a round for the bar first. That'll get you more answers. :)