I've had, in order:
1980 Rabbit,
1980 Vanagon,
1986 GTI,
1986 Saab 900,
1984 Rabbit Diesel,
1995 Saab 900S,
2000 Golf 2.oL,
1988 Volvo 740 Turbo,
1999 Volvo V70 XC "Cross Country" (current),
2003 Passat (current)
I've had more VWs than anything, but no A3s. My A2 GTI ('86, the last 8-valve GTIs with "high content") was dreadful as far as reliability was concerned. It was a blast to drive, but the transmission had problems and build quality was practically Soviet Union. I've never had an A3 VW, but my dad has had three or four. I think they're pretty decent cars for what they are. They get really good fuel economy, and can be pretty fun if you do things to them.
Saab:
If you're looking at "classic" Saab 900s, I think you can find a really dependable car. Bear in mind the newest "classic" 900 is now over 17 years old, so my recommendation may not hold water as these cars age. I do know the "new generation" 900 and the first-gen 9-3s are pretty bad cars. At least my 1995 900 was. From what I've gathered, the manual transmissions are weak, the turbo engines sludge up if not maintained better than by-the-book, and they performed really badly in crash tests. That said, the 9-5s are far superior in every regard. Get an Aero; from what I've read, the Aero engines are better in terms of reliability than the low-pressure turbos. I'm not too familiar with the 2003 and later 9-3s, but I've been impressed with how they drive. And they're cheap.
VW:
I have an '03 Passat V6, 5-speed manual which we bought with around 100,000 miles. It has been nearly flawless in terms of reliability. I bought my 2000 Golf new, and it was also practically flawless, although I sold it at about 47,000 miles.
Volvo: (Sometime I'll tell you about my stick-shift '88 740 turbo. It was wonderful.)
We also have a '99 Volvo Cross Country; it also had around 100,000 miles when we bought it. It has been pretty good overall, but more trouble than the Passat. The center differentials in early AWD Volvos are pretty fragile, and ours went out a couple years ago, costing nearly $2000 to put right. My mechanic, however, says the 850/70-series Volvos are pretty bulletproof, and I agree except for the AWD system.
As far as driving them goes, I think the Volvo is a nice comfy cruiser, the Passat is a bit more sporting, and I find the Saab 9-5 the best drive of the three. Our Volvo seems mushy and unresponsive compared to the Passat or Saab 9-5. A Volvo with a stick shift and FWD would probably be far more fun to drive than our automatic Cross Country.