I'm pretty sure there's a performance hit when using 6.5.x. However, it is a little more finger friendly, and a little less ugly than 6.1. So, that's the debate.
If I can integrate a nice contacts manager into 6.1, then I think I will revert to 6.1 again (I already used ThumbCal for my appointments and tasks). I just don't really see what 6.5.x brings to the table, once you start using MobileShell or Manila over the native kernel, considering 6.1 is faster and less of a memory and resource hog.
So, the plan is 6.1 + MobileShell + OverClocking. Should put those iPhones to shame!
