Slooow down a bit. I may have missed something earlier in the thread, but I will ask here anyway: What are your future plans? If you don't give us some idea we won't be able to suggest the right machine.
If you intend not to have more than a couple of colonies a small extractor is adequate. If you expect to expand in the future, consider the costs of upgrading. Actually, it may be not a lot, as good extractors are fetching silly money second hand. There again the hassle may not be worth it and a larger one now might be a better investment.
Remember, though, these may be machines used only twice (2 separate days) a year and take up a lot of space!
Before this year, I would have said the 9 frame radial, with or without tangential screens, was the popular size. Not so sure now with so many new starters.
I think I would search around for the loan/hire alternatives, if cash is tight, and leave the extractor purchase for a later date. There are often special offers in the dead of winter and might be quite a few good nearly new machines on the market if the present beekeeping craze wears off.....
Regards, RAB