Id run hell andy and meph with a fireball sorc. Use moat trick on meph, and just teleport to the right wall near andy, and hurl fireballs at her. Everything is fire immune down there, but andy is so weak against fire that I kill her in 4 fireballs in a 1 player game (6k fireball).
I can pretty much handle up to 5 players in a game as long as andy is not surrounded by fire immune monsters. Occasionally you do get swamped though.
I have found 5 sojs from hell andy/meph, as opposed to no sojs from nm andy/meph. I've probably done equal ammount of runs on both difficulties. Also the better rares drop in hell.
A good place in classic is still the pits. But dual element sorcs are kind of lame in classic (not enough +skill items). So I guess the best bet for pits would be a poison necro or a barb. (maybe poison ama can do it)
Blizzard is alright for hell meph, but I think it is too slow for hell andy. It is of course, much safer, you can clear the area, and then attack andy on your own time, but I like the fast and furious attack of fireball. Faster runs = more items.
I currently run ~44 mf, only source comming from my tarn.
Travincal runs are absolutely the best money maker in my opinon. The best for doing trav runs would be a barb. Run with high %gold find, and make sure you put a reasonable amount into find item, so you can pop those bodies all over again. Almost doubles the amount of cash per run. Hammerdins rock at trav runs too, but they don't get the added benefit of find item.
I usually team up with a paladin myself, I bo him, he kills, I pop bodies
