Unless you can get the 32X dirt cheap I would advise aganist getting one. There's only a couple games worth playing, you mentioned Knuckles Chaotix & Kolibri. Besides that the only worthwhile games I can think of are Blackthorne & Tempo. With that said I don't think any of these games are good enough to justify buying a 32X. Unlike the

CD there just aren't that many hidden gems or games that hold up well.
Also the 32X requires it's own power source, so you have another bulky AC adapter to plug in. It's just too much of a pain.