A whole world of retro gaming and alternative computing await you if you decide to keep the machine and deck it out with 8MB RAM, an IDE-CF adapter and a 4GB Compact Flash card, but I'm sure anyone who buys it from you will know just how much fun they'll get from it!
The SX32 alone is worth quite a bit, just make sure if you sell it it's going to someone who will use it, not resell it on eBay for a lot more than he paid you for it. Don't get ripped off, you have a valuable Amiga combination there.