I would go with the Mini. We have a TM-2P and are thinking about a mini for our stainless parts. The TM runs aluminum just fine but could use the rigidity of the mini for stainless parts. The Mini is a more rigid machine.
We get along fine with a 5HP piston compressor. Ours is a true 5HP, not whatever passes as 5HP from the marketing propaganda from the big box stores. Started out life as a Craftsman ''7.5 HP" (actual 5 HP) single phase, now has a 3 phase 5 HP motor/ VFD power. For inexpensive, I would buy the best ''5HP'' (most are really around 3 HP) deal I could find and just replace the motor when the original fails. Most of the pumps are pretty good and will far outlast the motor. I think the Harbor Freight pumps are made in Italy. Get the largest tank available, normally 80 gal. I have 260 gal of air storage capacity and a Harbor Freight refrigerated air dryer. I run it at 125 PSI (rated at 175 PSI) with a 5 PSI differential. You will kill a single phase motor pretty quickly operating like this, so plan on a 3 phase motor down the road about a year. But we use a lot of air.