I bought a 91 E30 BMW 318i to teach myself how to drive stick. It was great - excellent clutch and shifter feel, very forgiving, nice managable car.
I had tried to learn prior on a friend's acura integra, but couldnt get the hang of it when trying twice.
My fiancee has an integra (we met after I learned how to drive stick), and I absolutely hate the clutch action and feel on hers as well.
My brother got his license, and so we tried an experiment - we first tried to teach him on my fiancee's integra, and it was really tough... THen we put him into my BMW, and he got the hang of it in a short while.
My finacee's sister would have learned on my BMW when she was up here just this past week - except that the headgasket let go - causing a coolant leak overboard
But the E30 BMW is a great car to learn on - nobody can really beat a BMW MT in terms of quality and feel... and that makes it easy.
Make sure the clutch isnt too heavy (like my brother's 3000 GT VR-4) or too light (like a neon that we're test driving to buy for her sister). The cavalier with the ecotec/getrag trans setup had good feel, and Id anticipate that it would be easy to learn on... and I can also vouch for the ford focus MT (ive driven one of these in the US Virgin islands (talk about tough to drive on hills!) and it has been great in feel, smoothness, etc. I test drive the jetta after my MB gfot hit, and it was a mix of good and bad... I think it would be OK to learn on.
My choices would be:
1) BMW
2) cavalier (late model, and likely the cobalt too)
3) ford focus
...
i) VW Jetta
j) neon
...
n) heavy clutch (powerful cars)
...
zz) integra
These are just my set of experiences. YMMV
JMH