My opinion, maybe do a little bit of fixing the paintwork and anything else that needs mending (although it looks like it's in excellent condition) but don't bother with trying to "modify" it, the xenon headlights sound OK but some of the other things on that list (spoiler, exhausts, air intake and why put a rear wiper blade on a sedan?) will make it look horrible (my opinion). Perhaps you're not talking about really drastic modifications (like a massive ricer spoiler) that would make it an eyesore but I don't think it's the kind of car that really suits being modified (it's a large, straightlaced luxury Japanese sedan, not a hatchback or coupe). Personally I think most overly modified cars look awful. My advice is to save your money and eventually put it towards a car you really want. Or spend it on something else, unless you really know what you're doing and what you want, I wouldn't bother tarting up that car, it looks fine as it is. If you really want new rims, just get something tasteful and not too flashy, at least it already has alloys, plastic hubcaps are crap.