If you go the 7-Speed MicroDrive set-up, here's something that is pretty cool. These are Suntour's version of Shimano's Rapid Fire shifters.
Be a little different than the more common Suntour "thumbie's"! (These are not mine either, just going down a Suntour rabbit-hole on eBay)...
7-Speed is different than 8-Speed and MicroDrive is different from non-MicroDrive. Finding the correct cassette is the hardest part.
But a sweet Suntour XC-Pro MicroDrive set-up is cool and shifts like butter when dialed in!
I believe that Suntour came out with XC Pro MicroDrive first and Shimano countered with XTR.
I have full XC Pro 8-speed MD on my Klein Fervor. Most was purchased when I built the bike back in 93/94, but I didn't get the hubs until I rebuilt it in 2020. Also in 2020, I found the 1 year only...
What cassette fits the XC Pro hub?
There were possible three different sizes, if I recall. One for 6-speed & 7-speed, one for 7-speed Microdrive & one for 8-speed Microdrive. I think that is correct.