I was in the same position as you in November 2008. I was able to get a quote of $1400.00 for 3 year from Wagner Motorsports in Worcester, MA for my 2006 K1200GT with 19k. Then I went to Max in NH, where I bought my 06, and mentioned the possibility of buying new or an extended warranty. That is when I decided it was worth buying new. I got 11k for my 06 and bought the new 08 for 16.5k. It basically cost me $5,100 for a new bike, new 3yr warranty and hopefully all prior issues fixed. Don't forget I was prepared to pay at least $1400.00 for the warranty so basically for an extra $3700 I got a new bike.
I have 1600miles so far and have been very happy with the bike. None of the issues I had with the 06 have come up on the 08. The seat is much better, no servo brake system, and everything feels a lot tighter.
You may also want to look at Second Wind BMW in New Hampshire if Max is not treating you well.
12' R1200GS Rallye
08' K1200GT (traded)
06' Audi A4 3.2Q