I have pretty much settled on this front end here...
http://www.ebay.com/itm/79-85-Mazda-...69554687414554
It is much more than I want to spend. But it is a bolt on piece so it saves me plenty of headache of mounting the bumper I have now and building an air dam or buying an air dam and mounting it.
I'll have to modify it a little for drag use, but it's a good start...