couple more pics
(boom01)
first you need to decide if you're going to stick w/ the bad 4 lug wheels and tiny brakes.
The first thing I would do is get a set of 5 lug hubs and 4 pot brakes from someone selling them on ebay or on www.rx7club.com and get that installed before wasting money on rims.
Check on that site for a how to on what you need.