Well there are a lot of factors you need to look into. Will this be a daily driver? Do you have a lot of disposable income in case something breaks/engine or turbos go out? These cars are getting older and aren't exactly the most reliable cars to begin with. It sounds like an okay deal price wise, but with 79k on it I'm sure the turbos aren't in the best shape. You figure they spin at like 100,000 rpm at boost and are subjected to tremendous heat from the rotary engine so they wear somewhat quickly. Check out
www.scuderiaciriani.com and
www.rx7turboturbo.com both of which have
tons of info. Before getting into one of these cars you need to read up a
LOT on them. They're very complicated, tempremental, and relatively unreliable, but offer a lot of performance and looks. I mean they can be made relatively reliable, but it'll never be nearly as reliable as the CRX you have by a long shot. It's a complicated, very high performance car and should be looked at as such. If you do go for it make sure you have some deep pockets just in case cuz you never kno if something might crap out on ya at any time. Don't take it as these cars are ticking timebombs, but that they're not meant just for any Joe Schmoe to just plop down a few grand and go out and romp on all the time and have it run forever. That's what a Supra is for

(just kiddin'). My engine blew at 48k miles and I treated it better than my own family (well okay maybe not like that but you get my point

). A good saying to heed is "One man's turbo is another man's problem"...and even more so on a twin turbo rotary. They're totally phenomenal cars, but have a lot of downfalls. Rotary engines create a lot of heat, plus the engine bay in a 3rd gen isn't vented the best, the pre-cat soaks up a LOT of underhood heat, the intercooler is useless, and the turbo control system is a nightmare (78 vac lines). If you absolutely "must have" one definately don't hurry to buy one (look around for a while...it took me about a year to get the right one) and educate yourself very well before you buy. Also have a very qualified (knowledgeable) rotary mechanic look the car over beforehand too.
Sorry for the long drawn out post, but hope this helps.