This is what I've got on my bikes at the moment. All Maxxis.
Ragley Ti. Front 2.4 Ardent 60a. Rear 2.25 Crossmark 60a – great fast rolling combination with decent volume. Brilliant on trail centre terrain and trail riding, rear is not that grippy in mud but fine where there's a rock / gravel base. I've been running this mix for a couple of long xc rides in Calderdale and South Pennines as well as for running skills courses at Gisburn Forest and Lee Quarry.
Ibis Tranny. Front High Roller 42a. Rear Crossmark 60a. I put the 42a tyre on the front for some steep and slippy tech riding round Hebden Bridge, it needs to come off now for something faster rolling, probably a 60a Minion.
Ibis Mojo. Front 2.35 42a Swampthing – brilliant winter tyre for the slither, also good on wet rocks and roots. Rear 2.35 60a Minion DHF – plenty of grip and fast enough rolling.