These are definite contenders for modern classic status in my opinion. Great cars, good to drive, pretty reliable and well put together and rare enough to not see another one every time you go for a drive (try that with an MX5 or an MGF). Not suggesting they will ever be worth megabucks, but people in the trade I have spoken to are of the opinion that values of good GTVs and Spiders will start to climb again soon. So if you have one, cherish it and it might just reward you in the long term.
They also have that rare appeal of looking entirely of their time, and yet they still somehow look contemporary. Proper timeless styling. I can think of very few vehicles that manage to stand the test of time so well. In fact only one other comes to mind, the Ducati 916. That is the highest praise I can think of.
If at first you don't succeed, use a bigger hammer