For a non-running parts bike with no title, $1/CC is a good start. A valid title adds value. Starts and runs adds, riding adds, registered and on the road adds, needs nothing ads to that. After that it's between the condition of the bike, the seller, and how far you're willing to go.
Is $2000 a good price, that's not such an easy question. I'd say if it's a rider with papers in good condition, probably. I've seen members pristine bikes on the twins sites go for less, sometimes.
Are there any of the same model for sale within 200 miles to compare to? 300 miles?