the suncut 45 is also much rarer, that kingston 45 was around before the stupid price increase. i have all the other rising sun 45s and kept waiting to get that kingston 45 cheap, i waited too long. the suncut 45 isn't valuable though, I agree with garethx's valuation.
there was a weird rising sun 45 just on ebay that I actually never saw before, it had a different artist on the flip, but the a-side was just "funky yolk" so I didn't bid high since I had that on kingston already.