Personally, I would rock something cheap and simple that you can pick up until you can save for the desired set. Grab some mini-lites, 280zx 6-spokes, etc, for a couple hundred and rock those. They are cheap, come in sizes that fit 510s perfect, and are respectable rims. You say that youre going to keep the car mostly stock except for a nice set of rims. If thats your only mod, would you want a set of wheels you can be proud of?- something you really like?
You already mention that you might hate yourself for purchasing XXRs... then why do it? My .02