Pencil Thin

I am looking for opinions on shoes. I need a new pair or two. I am guessing I should probably get cross-trainers, but would also really like some shape-up type shoes. I like to run, do kick-boxing, weight training, step aerobics, and biking. So, a good multi purpose shoe! Anybody have anything they really like? Even a favorite brand. I love ASICS. For my foot they fit great. Since I try not to wear the same shoe for running that I do for cross training I find myself in need of new shoes. Cross training can makes your shoe break down more in the lateral motion and can cause you to have sore knees and ankles if you wear them while running.
Remember also, running shoes NEED to be replaced every 500 hundred miles. If you are running that is less than every 6 months! As states already, worth it in the long run!