Hmm, a lot of ground already covered, but to be brief:
The Last Starfighter was my absolute favourite film in my youth, and I still remember it fondly. I don't so much want a sequel, as a proper remake/update for today, which is what I'm hoping that IMDB link above is referring to (but if you can pull off both, like Tron 2.0 appears to be going for, that's cool too).
eXistenZ wasn't Cronenburg's greatest, no, but mediocrity from a genius is still better than most dreck out there. This was basically trying to redo Videodrome for interactive entertainment, while throwing in some "artist as martyr" themes as well (inspired by his friend Salman Rushdie and Cronenburg's own massive persecution complex).
Avalon: I know Oshii always builds to a big mindscrew philosophical diatribe by the third act, and I still consider the plot of the first Patlabor movie to have one of the best Xanatos Gambits ever, but Avalon kind of lost me at the end. Which is too bad--I thought it had a great premise, and the cinematography was fantastic. (Having authentic Soviet war machines for the opening battle sequence courtesy of the Polish Army greatly pleased the adolescent 80s action movie fan.)
As long as we're talking movies with video game inspirations, clearly the titular course in last year's Death Race has the whole combat racing game with weapon powerups going on. I thought that part was pretty clever, even if the rest of the movie lacked the humour, fun and soul of the original. Still, I'll pretty much watch Jason Statham kick ass in anything.