gamesaccess question-GTA games and billing cycling

[deeplove]

For those who are using their service, how many games on average do you manage to play a month? (also, please mention which plan you have)

I'm trying to decide on whether I should choose the bill quarterly or monthly option. Not sure how long i'll stick with them. Planning to buy a psp slim very soon to play GTA games (waste some time until gta iv comes out).
Do you think its likely ill finish both liberty city stories and vice city stories in one month (doing just the missions..i don't care much about the firetruck, ambulance and the side stuff)? of course ill also look at other psp games but those 2 are on my "must-play" list.

p.s. haha.. its my 666 post...