blown up 09 yz450f - whats it worth

I been scouring cl looking for a deal on a 450, kinda want a project bike and want your guys opinion. I found a 09 yz450 which is a bike i love. It dropped a valve. Heads junk, piston cyl and valves. We all know thats $1500 in parts. I got a guy who can fix the head for under 200 bucks but im still out piston valves cyl, $1000 min anyway you look at it. He had it listed for 800, i offered 4 and told him by the time someone drops the cash on parts they could have bought a running one. Id be ok with 400, 600 IMO is too much for a 450 with a boat anchor of a motor. Its 3 hours away also. Thoughts