I say buy a house, keep the supra, and MOD THE HOUSE
Make your garage the way you want it with the exception of the GF permission or negotiation before hand. THEN mod the supra.
PS its a crap shoot to wait and see if the housing market is going to get worse. Yes it looks like it will and yes i agree it will but how much longer till it gets better no one can say. I say look for houses now, if u find something work to get it and when the time comes youmay have more then what you expected to have it and fix it up a big