If you don't want AC3 and you're going to drop 60-70 on GTA V anyway, then the GTA V PS3 bundle is a more viable option.
I bought Assassin's Creed and honestly, it looked more fun than it actually was.
But at the same time if a person is buying a PS3 just to play GTA V why buy a bundle for $40 bucks cheaper that comes with a game someone might not be interested in and a game that's been out for close to over a year and Assassins Creed Black Flag will be out less than 2 months after GTA V is out and will be on next gen consoles.
You won't even be able to get close to $25 trying to sell Assassins Creed 3 to gamestop, Best Buy, or amazon.Heck maybe you might be able to get $25 for it on craigslist.