Does it play? Are cabs hard to find in your area? I bought a nonworking nintendo cab for $40.
$225 sounds a bit high to start on a DK project, but if it is worth it to you, that is all that matters. Keep in mind that bezel, marquee, side art, controls, pcb... This stuff can add up to over $400. I know, I need them all.
Let us know what you decide.