I thought I'd add my 2 cents and give you a few things to consider...
I can make a guess why the '05 you're considering has low mileage... HEAT! I owned an '05/ABS since April 2005. Make no mistake, it was a nice bike. I really liked it, with one exception - it could be a nightmare to drive on warm days, or even moderately warm days. And God forbid you get caught in a traffic jam on a really hot day, riding two up - you WILL cook. I remember several times I couldn't wait to get home, just to get off the thing! I found myself only driving my FJR on days with lower temps and humidity. Unfortunately here in northern Virginia, summer time typically means heat and high humidity levels. So my FJR didn't rack up many miles. I also own an '05 Suzuki Hayabusa and it is much cooler to drive than my '05 FJR. Anytime the temps were above 85 and the humidity was high, my FJR sat in the garage collecting dust.
Just last week I traded my '05 FJR in on an '07 (A model). I made the trade for only one reason, the heat issue with my '05.
The dealer gave me $8,300 for my '05, and sold me a new '07 for $12,700. No doubt I could have made a bit more selling my '05 outright, but I didn't want to hassle with selling it myself.
IMO, unless you live in a state near the Canadian boarder, (or just enjoy oven-like heat cookin' your bod), I'd forget buying the low mileage '05. Also forget about the higher mileage '06 too. I recommend just continuing to look around. You have a couple of things weighing in your favor... one, the '08's will be on the showroom floors soon. And two, the colder weather is right around the corner. Both of these things will push the prices of the '06's and '07's down very soon.
By the way, the '07's (and probably the '06's?), have a few nice bells and whistles that the '05 doesn't have; such as a gear indicator, mileage indicator, and adjustable bars and seat. But best of all, the newer models are COOLER. With my '07 I still feel a bit of heat on my ankles, but it's very tolerable, and hands down cooler than my '05. Thank you Yamaha!