The issue is YOUR sensible offer is going to be different from MY sensible offer.
Unless you give some idea of what you are looking for it's kind of difficult.
Especially with the Cryptograffiti stuff being all over the place in price. I just picked up one of his pieces for under $50 and others have gone for over $1000 so....
-Dave
If I recall correctly, original selling price was around $1300 or so. I would imagine value has increased quite a bit since that time. Only 5 were ever produced, numbered and signed by Peter.
Edit: Now I am second guessing myself...might have been $2000. Hm..