I'm in the same boat, been looking for a couple of weeks now. I actually bought one from KEH a few weeks ago and it was fine for about 10 days, but then the LCD got wonky so I returned it (luckily I could). Of course, the day I bought it from KEH, one came up for sale on RFF, and then a few more came up. But since my KEH one seemed fine I had no need to buy one. Now when I want one there are none to be had!
For me the R-D1 was addicting. The process of operating the lever and RF focusing was very calming, it made me shoot much more thoughtfully than with a dslr. The smaller (slimmer) size compared to a dslr was also nice, especially the size of the lenses. I'm looking forward to getting another one, hopefully we won't be bidding against each other, lol.
Just a thought, you may want to try a cheap film rangefinder first if you're unsure, I could see it not being for everyone. I tried a Canonet QL17 (can be had cheap) before buying the R-D1. Now that I think about it, though, if you buy an R-D1, you'll almost certainly be able to turn around and sell it for no loss if you don't like it. Good luck.