Should I get Pathfinder?

[Novawurmson]

I prefer using a PF basis and then backporting anything I need from 3.5. Ideally on top of that if there's a PF and a 3.5 thing with the same name (Power Attack comes to mind) I'd consider allowing both.

This. Pathfinder is like a big patch for 3.5; doesn't change much, but has a lot of nice tweaks here and there. I like to say that Pathfinder is about 5-10% better than 3.5 (in my opinion); everyone gets a few more choices and a little more polish. Don't throw out your 3.5 material, just combine the two.