My aunt and I want to fix up an old VW Beetle. We are thinking of 60's and 70's but it has to run and have no rust (not so hard to find in Arizona). We're thinking in the $2000-2500 range or so, paint doesn't matter cause we'll have it repainted and interior doesn't matter too much either, just needs to have a good running foundation. What are some good years? Other than not being the most reliable thing on the road, what is there to know about them? It won't be a daily driver.

She's decided she has to have an old one to fit in with the other 2 TDI's.
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2004 VW Beetle TDI 163k
(Yeah it's a chick car but it gets me 40 mpg)