I don't believe its that hard, I would go for the 5k myself although the 4k in the ke20 was a good laugh.
For 1200 you should be able to getone or even rebuild a nice one. If you need a 4k that just needs a head , or you are looking for a 5k to rebuild ,let me know ,there might be bits in the shed.
you'll be able to find my email address in my profile.
Good Luck, Ben.