I have an RC; it is a very nice little camera. I currently don't use it much because it needs a CLA ... nothing major, I just suspect the shutter speeds may be a bit slow.
In auto mode it's very easy to use, but for manual exposure I find the controls so small that it's a bit fiddly to shoot that way. I haven't practised a lot in manual mode, so maybe that would change with more use.
My sense is that the RD controls are a bit easier to use, but that is only from reading what others have said.
Here's what you might do, if you have the cash and the inclination: Buy an RC and see what you think. It shouldn't have the oily blades problem, and a CLA, if necessary, would be much than an RD.
Then, keep searching for an RD and just figure in about $100USD plus shipping for a good CLA. Any RD you find on eBay is risky, IMO. Even when clearly stated that the blades are sticky, they go for a fairly high price. I would post a WTB here, plus visit thrift stores, contact camera stores that deal with used equipment and alert them that you're looking for one, etc.
Good luck.