I heartily endorse the PFM drying towels and also the Super Plush Jrs, they're probably my favorites as far as their applications/uses.
I would suggest you add some of these 16 x 16 PFM's. They're essentially identical to the PFM drying towels except the smaller size makes them easier to handle and good for tight spots, etc. I use one in addition to my large towel when drying the vehicle - first I use the large towel all over then go back over with the small towel for my final drying touchup. People who primarily use a blower for drying still like to have one of these 16 x 16's as well.
Griots Garage PFM Terry Weave Towel, Set of 2
For a long time, this was one of Mike P.'s "go to" MF's as it has a myriad of uses, esp. for removal of waxes, compounds, sealants, etc. Buy 'em by the dozen. I find myself using these MF's for a lot of things, and at their low price point, I also use them to cut up in to small pieces to use as applicators.
Cobra 12 Pack Forrest Green Edgeless Microfiber Polishing Cloths
This seems to be one of Mike's new favorite MF's and he suggests it's useful for far more than just glass cleaning (as per its item description). I haven't tried these yet but if Mike says they're good, they're good.
The Rag Company FTW Premium Orange Microfiber Towel
And speaking of glass cleaning, that's another PFM that I use and like a lot.
Griots Garage PFM Dual Weave Glass Towel, Set of 4
Finally, you need some bulk MF's to use for all purpose towels. For that, the Kirkland MF's at Costco are great ... $18 for 36 (they also sell a case of 324 for $119 !). These are actually quite decent towels ... 365GSM, nice nap.