I have three Synta-made Maksutov telescopes (C90, 127 Mak and 180 Mak), all are between f/12 and f/15.
For these, 25 mm focal length with 60 degrees AFOV will pretty much maximize the true field of view (or a 32 mm Plossl with 50 degrees AFOV). That gives you the low-magnification end.
For high magnification, I found that these instuments can only go as high as about 35X per inch of aperture. An eyepiece with focal length in mm equal to the focal ration of the telescope will give 25X per inch of aperture. For the C90, that would be a 12 mm focal length eyepiece. For 35X per inch, an 8 mm eyepiece is fine. No need to go to any higher magnification.
The suggestion of a 8-24 mm zoom eyepiece is a good one, however bear in mind that zoom eyepieces have decent AFOV only at the smallest focal lengths, and only about 40 degrees AFOV at the longest focal length. I find this a bit narrow. A 8-24 mm zoom and a 32 mm Plossl could do, though.
Personally, when I assemble a small kit to go observing with my Maks, I bring three Agena Astro Starguider Dual ED 60 degrees AFOV eyepieces (same as Astro-Tech Paradigm): 25 mm, 15 mm and 8 mm. I have also used BST Flat Field eyepieces in the past, also available from Agena: 27 mm, 19 mm, 12 mm and 8 mm. All eyepieces are 60$-70$ each and are a very good bang for the money, the Dual ED being slightly better.
Explore Scientific 68 degrees eyepieces are nice, sharpness and contrast; the 24 mm could be a good choice for the low magnification. I sold mine, though: the 68 degrees AFOV is achieved through copious amounts of pincushion distortion, and the true field of view is about the same as the Dual ED 24 mm 60 degrees AFOV. For me, I find geometric distortion objectionable in an eyepiece, specially if terrestrial observation is on the menu. So I prefer the Dual ED and the Flat Fields over the Explore Scientific. Hope this helps!
Edited by ChristianG, 21 August 2014 - 03:29 PM.