I'd recommend you go to the feed the beast website and download their launcher, which makes it easy to install modpacks. I'm playing direwolf20's modpack 1.7.10, it's awesome. It's got so much crap in it I've barely scratched the surface. If you install it, go to his youtube channel and watch his season 7 episodes where he just plays his own modpack and shows you how to get up and running fast. I haven't had any problems witch crashing. I think there are a few bugs / conflicts in the mod pack but nothing game stopping from what I can tell.