What to give for SX-1 / SX-32 for Cd32?

I am looking to expand my cd32 into a a1200 with cd drive, but i just got bummed out on bidding on an ebay auction when it crossed 227 usd. Might not be that expensive for an sx-1 for what I know, but my use is not as collective but for use.

But for that price I can buy a refurbished a1200, and I can't figure out what a sx-1 does to an cd32 that a a1200 doesn't do beside the a1200 beeing alot more upgradeable.

So since I will be looking out for them, what should i pay? and are there anyone selling?