I use these: 34 and 146 the most. I often try them together with greenbacks too and like 101, 103, 131, 132, 147 and 148.
034 — 4x12 BASKETWEAVE G12H30 (RW) — "'68 Marshall Basketweave 4x12 loaded with a matched quad of vintage, 30-watt, Celestion G12H "blackbacks". T1281 frames and "444", 55Hz bass cones from the late 70's. Unleash your inner Jimi, or Jimmy, if you prefer".
057 — 4x12 SLM H75 (OH) — SLM Electronics 4x12 with Scumback H75 speakers.
064 — 4x12 30W (Ultra) — 4x12 with G12H30s, ported from the Ultra.
146 — 4x12 MAR-CB H-PR-55 MIX (OH) — Marshall 4x12 cabinet, with four 12" Pre-Rola G12H30 speakers, UltraRes.
some times I mix them
In real life I play rock gigs with a 1965 Vox AC50 with a matching trolly cab with 2 x 12 G12H 75hz cones (the speaker Marshall never used) a cab that gives me some of the same feeling and clarity is:
070 — 4x12 BEATLE GB — Vox Beatle 4x12 with greenbacks, so greensbacks but I get the same vibe.
These two I just messed a little bit around with.
016 — 1x12 BRIT G12H30 (RW) — "Celestion G12H30, housed in a solid mahogany, open-backed cabinet".
116 — 1x12 SCUMTONE 25W MIX — Cas Azera Tone-Tools detuned 1x12 with Scumback H55.
When practicing on real amps we have some vintage Marshalls and Cabs that is my reference. If I ever get a II I will most likely shoot IR's of these myself, same goes for a Hi-Watt cab with Fanes that has something that I really like. After I have messed around with the AX8 for a couple of months I am starting to gravitate towards 2 x 12 cabs for overdriven and distorted sounds (I mostly play clean tho).