Soma and Oxy's great. I've tried Oxy + benzos, and I really didn't like it as much, and I was on edge the next day - Prefer the benzos on their own (by which I mean....)
Benzos + Weed
Xanax + 4-HO-MET (Actually works out surprisingly well. Carefree, uncoordinated, relaxing trip. Purely recreational - no chance for spiritual growth or realizations here

)
2C-B + 4-HO-MET - Ridiculously visual. Was still getting minor visuals for 2 days after though....
Ones that were dissapointing:
Oxy + Benzos
4-HO-MET + Soma + Oxy - just dulled out the trip. Achieved what i'd intended with Xanax+4-HO-MET though
Soma + Lorazepam - Lorazepam normally brings some increased creativity. Adding soma just blotted that out and made me feel dull and drowsy.
2C-I/B/C + Alcohol - Always end up drinking too much if I start drinking on these, and winding up feeling like utter shit the next day.
Other psyches + alcohol - Can't stand drinking, makes the alcohol taste horrible.