Anything you put into it you can likely get back out of it if you ever sell it. Besides, what kind of newer low end bike could you get for the cost of tires, tape, a tune up a saddle and maybe wheels and chain? No kind, thats what. Any used newer low end bike is going to cost 300+, you'll get that done for much less if you do the work yourself. Don't buy new wheels unless you really need them, just fix those up if need be.