If you are buying any of these older units that hasn't seen a tech recently, you are taking pot luck with regard to longevity - might last forever OK, might need some help sometime. Usually it's not major, but some are complex to disassemble to work on, so it costs in the hourly rate.
For an actual vintage unit, my suggestion would be a Yamaha CR-xxx/xxxx. They are generally similar, but the larger numbers mean a unit higher up the chain in terms of features and power.
These vintage units are often very nice, but they are not as sonically superior as some of the vintage based sites might like you to think - some are not even that good. I think they can be pretty so I have a few floating around here that I'll test and restore later and have done quite a few over the years.
With a limited budget, and the desire for a system you can use for a while without hassles, I'd suggest NOT vintage as they are escalating in price. Look for a good late model receiver or amp/tuner combo, made in Japan or Taiwan in the late 80's or 90's that has the feature set you're looking for, eg phono pre.