$20,000. I've seen them from $17,000 on up to $30,000. Mine has gyros, radio, xponder, VOR/LOC/GS. I wouldn't fly it IFR though. The gyros are all venturi driven and are not that accurate. Not to mention, the VOR/LOC/GS/COMM all use the same antenna, so an ILS isn't that accurate either. Anyway, it is a fair weather machine, time builder. Costs about $10.00/hour to operate. (not including engine reserves) Dirt cheap flying. Unless something breaks, of course. I did have to have a cylinder overhauled at about $600. Nevertheless, I've flown about 50 hours so far in it, and have only put about $1000 into it, plus gas and insurance.
Not to mention tailwheel flying will make you a better pilot. Keeps you awake on t/o and landing. It's a real dream to fly, though. Low and slow, cheap, etc. It does not do well over mountains in the summer time. Density altitude is not good when you only have 85 HP.