Hi Peter,
Vixen LVW's, Baader Hyperions, Celestron Ultima LX's, Orion Stratus, and various TV's and some others, are dual 2" and 1.25".
HOWEVER, from my recent
experiences, not all of these are equally matched to the different telescope optical systems, as with all other eyepieces, 2" or 1.25"
I'll give you an example, the 8mm LVW, 8mm LX and 8mm Hyperion all worked very well in an SCT. But in a fast reflector, the LVW & the LX both performed well, but the Hyperion showed pincushion. While the eyerelief on the Hyperion was the longest (20mm vs 16 on the other two), the LVW and the LX were actually easier on the eye - less eyestrain. I don't quite understand why this is, but "ease of use" is also something that isn't spoken about. This too happens within the various focal lengths of a model: The 8mmLVW is by far the easiest on the eye of all the LVW focal lengths too! and the LVW's are all nice EPs.
The 13mm Ethos (also dual 2" and 1.25") is also easier on the eye than the 21mm Ethos too.
This isn't hearsay, but my actual experience.
My 5mm Hyperion in my 8" f/4 dob is FANTASTIC! I use it as a 2" EP.
In my search for my "perfect" EP collection, I've been learning this the hard way, $$$. EP manufacturers do not mention the optical matching of thier EPs to different telescope optical systems. Many reviews are also thrwart with a lack of thourgh mixing-it-up with different scopes and f/ratios.
What is the scope/s you have, and how much are you looking to spend?