You can help us, to help you, by telling us where you live. City, state, add it under your screen name.
An expected price at the start of the riding season in NYS in April is gonna be different from the same bike in November, same place. Because of multiple factors, (end of the year/riding season, people out of work, selling-off their toys to survive) prices are likely going to be down, so a buyer's market. A stone-stock bike with relatively low miles is worth more-than a high-mileage bike which needs consumables: tires, brake pads, a battery, oil change, carbs cleaned, etc.
I'd say $3,000-$4,000 is probably where you would find a stock bike, with desireable accessories, for a 2005-'07; that could bump up a bit, but you never get what you paid for accessories at the time of sale. A bike w/more miles, well-maintained, and perhaps a few accessories, I would say at the $2,500-$3,000 range. You area may have different prices, maybe a bit-higher. These are person-to-person prices, anything at a business would probably be $1,000-$1,500 more, so on the top-end, that would be a $5,500 bike, low-miles, needing-nothing.