Barry R can help you a lot; also check out the FE forum, the guys are great there.
http://www.network54.com/Forum/74182/
Many of the guys on the FE forum seem to build low dollar high quality FEs and some of the guys build high dollar high quality FEs, and I don't think anyone that is a regular is building grenades.
I think a low dollar good quality 390 build has some merit, but I have not started mine yet so ...