Why don't you and the guy looking to get rid of his bowtech just swap!

I have an 8 year old bow and it still shoots just fine. Save your money, it kills a deer just as good as any. Besides it already sounds like a screamer. New toys are always nice, but with the family factor you never know when you will need a little extra cash. If you need something new, just get the sight. Never can tell when you'll need that cash on hand.
Just a thought.
Justin