They hold their price pretty well because they're beautiful!
I'd think from a dealer you'd be looking at 2-2500 squid for something really good with low mileage... Personally I'd be looking at ZX9R's for the same money - but they don't look half as nice!
Try and find one in a dealers and sit you and your GF on it to see if both of your feet are jammed into your armpits and whether you can live with that for any distance!