Thinking about getting back into running some games. All my books are 3e... any advice on what i can "adapt" via house rules to make my life easier? After watching some videos of 4e, I really do think there are some fun things I can adapt to my game.

But, is it an insane headache to try? the problem is that I just can't justify dropping $60 on the three core 4e books when I might use them only once... hence my desire to stick to 3e as a base.

I figured it couldn't hurt to ask!