I am parting ways with my 96 GS 500.  It has 16k and is in good condition.  I am getting a Suzuki M50.

http://pittsburgh.craigslist.org/mcy/1380343238.html

I wouldn't put in the ad that you're "upgrading".  The M50 is a totally different bike so whether you're "upgrading" or not is debatable, and isn't relevant to your GS.  It might make potential buyers go look at other bikes and forget yours.  You want to attract and hold peoples' attention with your ad, not potentially drive them away.

Then again, it is Craiglist.  The fact that he is using punctuation and grammar easily slips him into the forefront of CL ads.