If you want to look at planets you will be absolutely maxing out the magnification on a 102 to see any real detail, don't go smaller.
Get the AT102ED at the least. I would never consider an achro for planets or the moon no matter what some people say.
I use the stellarvue M2C manual alt/az mount system (with add on handle) with my ES 127mm FCD100 triplet and it handles it fine until I pull out the massively heavy ES eyepieces I use (see sig) and then it takes a nose dive. With an eyepiece in it moves fluid smooth and doesn't move when you let go. Its not possible with the roller needle bearings it uses to lock it absolutely tight so you lose your target during eyepiece changes otherwise I like it.
I use the massive wide angle lenses I do so that even with my 5.5mm I can still super easily find targets with the red dot finder I use rather than trying to do a stable swap from a lower power eyepiece.
There is sorta a crap selection of manual alt/az mounts out there.
I would not be happy at all with less magnification than I have with my 127mm for planetary and I absolutely love how perfectly clear and false color free the views are. I actually plan to get an Ethos 3.7mm to really max it out which at .49mm exit pupil will be the limit I think.
Also keep in mind with ES you have the "essential series" which are FCD-1 glass triplets an then the more expensive FCD100 triplets which color correct better but might be slightly overkill for pure visual (I like overkill however).
EDIT: Here is the full system I am talking about, I have only seen it available from Stellarvue. You really do need all the parts anyways so its easier to get as a system. It comes with the CGEM tripod from Celestron (actually ships in their box) which is very nice. Seems to be on backorder.
Here is the way overpriced handle which should be included in the already expensive mount. I bought it because I didn't like yanking on the scope itself to move it around. Its super helpful at some angles and useless at others and a tad short but still usable with my 127mm.
Edited by PPPPPP42, 30 October 2019 - 06:16 PM.