Running Arch EX with XFusion Slants, which I’ve run at both 100 and 120mm on mine. Think I prefer them at 120. Clearance is ok at the back with the Arch EX and 2.25 Maxxis Ardent or Ikon, certainly not had any rubbing on the inside of the chainstays.
I think the Reba would be a good choice though. I nearly went for them, but couldn’t find any cheap deals when I was building mine, so went for the XFusion ones, which have been really reliable. My only gripe with them is the frankly ridiculous 1.5mm hex screw which holds the rebound adjuster on, which needs to be removed in order to do a lower leg/seal service etc. Why oh why not stick a Torx screw on there instead, or something less likely to slip.