2000 model 22,000miles £5999
I bought a 2001 new, paid £8k, so the above has lost £2k over 4 years!! I know the dealer would only give you £4.5k and bang it out for £6k but these were the reasons why i stopped looking at second hand and bought new. At the time i was looking at 3 or 4 yr old bikes that were less than £2k cheaper than a new one. It didn't make sense when i could just afford to buy a new 'un.
I reckon if you go down anything other than the GS route, in weeks/months/years to come, you'll be selling at a big loss in order to buy what you know is the sense choice now.
Do the test ride stuff, buy the GS and enjoy. You will not regret it
( I sold my ADV in April and was to give up biking, less than 6 months and i was pining, now got a lovely 1100RS to be traded in the spring for a GS.)