No matter what it is, what do you NOT regret buying or feel you got the most use out of, so you feel was worth every cent? And how much was it?
Myself, best thing I ever bought was Fisher Price Soothing Motions Glider. Cost $180 brand new. I used it for both my kids, to sleep in at night for 8 months each (from birth til 8 months, it was their bed)