I was in your same boat right around New Years time. My problem was the car was also in Seattle, but I live in Boise. Needless to say I went up there and picked it up and haven't regretted it one bit. Mine is an '05 limited roadster with a stick. There are basically only 3 trim levels on these cars, and the only one that is majorly different is the SRT-6. I find the amenities on my limited are quite nice without being overbearing.
There seems to be a few prevalent problems with these cars, but nothing really major at all. The biggest things I seem to note on the forum (and only slightly notice on my car) are things like first gear on the transmission can sometimes be hard to get to go in to gear. The only time I notice it with mine is when its cold (25*~40*ish) and goes away when warmed up. The coupes don't have the common roadster rear window failure (mine either, fingers crossed on that one) so that is one of the problems you will never have to deal with. The Relay board tends to have a weak solder point that can cause you a no-start issue. 15 minutes and I had mine repaired thanks to a thread started by tighed(sp?). The only other real major issue that is reported a lot is tire noise. It seems like it all really depends on what tires are on it and how much tread is on them. I have Toyo Proxess 4's on my car (don't like them but its what it came with) and I don't seem to get any more tire noise than my wife's Pacifica. Surprisingly I don't get much wind noise from the convertible top either.
As far as pricing, their asking price is a bit high in my opinion. I paid $14K OTD for mine with only 67K miles. Mine DID however have a small accident which was repaired by the dealer I bought it from so that was reflected in the pricing somewhat. I drove it home to Boise the next day, got 35MPG out of it, and had a blast pretty much the whole way home.
Basically it comes down to how much do you like the car and how much are you willing to pay for it to have it. They are very fun, super reliable and not commonly seen on the roads.
Good luck and welcome to the forum!