With my C9.25 I have used a variety of the EPs listed earlier in the thread (I have a 15mm Axiom, 24mm Pano, and a 32mm & 55mm TV Plossl). Although the Axiom is an ok EP - assuming your C9.25 is on a tracked mount, I would prefer a TV Plossl to the Axiom. If the budget allows, the Pano would be my option. The views are crisper than an Axiom and you don't need the extra FOV IMO if you are on a tracked mount. Otherwise, go the 32mm TB Plossl. Same FOV as the 24mm Pano. Any EP over 30mm is more for star hopping with a dob in my experience.
Personally I prefer a Pano to a Nagler for a tracked mount - but I know I will get plenty of opinions on that issue.
That said, I have over a dozen EPs covering the brands of Celestron (Axiom & Plossl), Sirius (Plossl), GSO (Plossl), Bintel (Plossl), TV (Plossl, Pano and Naglers) and seriously think TV is the most consistent - even in the Plossl range.
