SVN isn't for developers only so much as it's for those who are willing to put up with developers' constant stream of changes, and occasional mistakes. Once you get the hang of using it it's much better and more flexible than any fixed download, as you can update or revert to previous versions easily.
I usually play on Large maps with 12ish starting civs, no revolutions, no barbarian civs (no new civs emerging from barbarian cities), Snail, and I have reached well into the Transhuman era (After Modern, before Galactic) without any major issues, and lower system specs than yours. That corresponds to turn counts of well over 1000 turns, though recent adjustments to tech costs have changed that significantly. I think my longest-running game, on the previously mentioned settings, was nearing the 2000 turn mark before the combination of boredom and SVN updates led to its abandonment, and turn times were still manageable. Slowdowns, of course, but even then I've rarely had turn timers go much above a few minutes at most. I haven't a clue as to how the pacing (or map size, for that matter) compares to those of AND2, but overall C2C is far more tolerant of larger (if not truly enormous) map sizes and longer games than it used to be, due to various technical breakthroughs made by programmers more talented than I.
There's currently a few erratic bugs relating to combat animations that remain unsolved, but I've always used Quick Combat and haven't had any reproducible/unavoidable crashes in quite some time.