G3 doesn't seem to be too bad IMO. I haven't tried the AFPD yet but by the sounds of it it is the best.
G3's only draw back IMO is it's short list of planes that come bundled with the package. I personally have no interest in helis and unfortunately for me the package comes with about 50% helis. Waste of space for me but you might enjoy them since you mentioned that you'd like to try them.
G3 has a huge list of backround customizing features that allow you to be pretty creative. These features are far beyond the needs of anyone who just wants to get up and flying.
I've had no problems with any glitches and I'm only running it on a machine several years old (1.3 Gig, ATI all in wonder 8500dv).
I give it a thumbs up. The only thing that would be nice is availability of free internet models as add ons...that will come I'm sure.
As far as a learning tool I think it fits the bill. As far as an entertainment tool for those who spend more time on the couch than at the field...well I suppose there might be better out there.
I downloaded FMS last night and while it has loads of models, they all fly way too easy and not anywhere near what you need to expect in the real world.

JMO