My '69 Plymouth "Satellite" 318 wagon, got for equivalent of $700 in '78. No problems. Sold her for $300 a few years later.
2nd, so far, is my '80 Chevy. $600i n 2010; starts Right up, I've had a few problems, though. Ran god when she ran, but developed huge oil leak. Needs crankshaft/transaxle pulled for proper repair, so she is drydocked at the moment.
My best motorcycle, for the money, must have been my '68 Triumph "Thunderbird" 650. Think I gave $600 for her in '79. Kept a year, traded up . Ratty ; but always a on-kicker.
My '83 Honda CB650SC cost me $300 in 2010, had 1350 Original miles on her. Needed battery, tlc. Rode her over 23,000 miles in last 8 years. Has needed a lot of work and tires, too.