eh more than likely u have a bad alternator, you should check the relays also, could b one of those, and try and clean it all up n tap on the battery posts with a pair of needle nose pliers with rubber handles, see if you can get sum juice in the posts..
well that car is well worth 20 grand with a good motor... so since the motor is blown the car can still go for 5 to 10 grand easily as long as the interiors good, all the bodys in good shape and it doesnt need break work or have any broken or missing parts. u could always throw an offer like 2k...
of course. people who want to race the rx-8's do an engine swap tho... they put the motor out of an rx-7 in this car juss because its a better motor, more parts available