I picked up a Delta 37-150 Jointer for $50 a while ago. It cuts just OK. Is it really worth it to put a helix head on it ~$400? The head is worth more than the machine itself. Or is it best to buy a machine with a helix head already installed? $400 is better than the cost of a new machine but I don't think I'd ever get my $$ back on the Delta if I wanted to sell it. Dilemma.....