I agree, whatever you can do and whatever you can enjoy is best!
For me, I have discovered weight lifting ... actually, I've always loved it, just never stuck with it so long. It's given me more energy and a better attitude about EVERYTHING. I typically dislike most aerobic type exercise and do it with reluctance! You can start a weight lifting program on the cheap, with books from the library and a set of dumbbells (typically around 50 cents a pound).