So, your pattern is 5 on 4-3/4 and 5 on 4-1/2? Centerline rims, or at least the ones I have, are drilled for both patterns.

I think your best bet is to just go to different tire places and see what they have in the way of used rims and tires. If you are wanting to drive it around a little bit before you buy your more expensive rims, then you aren't going to want to skimp too much. Better yet, go to the junk yard. I'd bet you come out of there with what you want for less than $50.