I want something that sounds better than what I have but in a much smaller form factor.
I don't know anything about your Celestion speakers but the RC52 is a larger center channel. Doubt a little satellite center can compete with that.
I've owned sat/sub systems and then replaced with bookshelf or tower speakers. The bookshelf/towers always sounded better.
the laws of physics are in effect here. you wont get bigger sound from much smaller speakers unless the larger speakers are not very good.