I haven't played a 2,000 point X-Men team in a while. But all the usual suspects were there:

Beast
Iceman
Professor X
Jean Grey
Cyclops
Storm
Gambit
Bishop
Wolverine
Angel/Archangel
Psylocke
Banshee
Cuckoos

Etc etc etc.

I haven't played a large X-Men team since the WoS Nightcrawler hit. Though I did play a 2,000 point Brotherhood/Hellfire Club team against a 2,000 point X-Men team. X-Men kicked my @$$. With Cyclops Trait, Nightcrawler, GSX Professor X, Psylocke and GSX Rogue (she was awesome for my buddy), I got creamed.

GSX Juggernaut 193
GSX Phoenix 297
GSX Cyclops 110
GSX Wolverine 103
GSX Beast 95
GSX Archangel 99
M&M Cuckoo 2 at 40 points each
GSX Psylocke 74
GSX Cable 140
GSX Prof X 123
GSX Armor 66
WOS Nightcrawler 86
MM Havok 44
M&M Gambit 90
M&M Bishop 100
GSX Storm 86
GSX Rogue 128
GSX Emma Frost 81
Gem 5
Total 2000 points of kick ### X-Men. Pretty much owns anything that is thrown your way. Heck of a lot of fun.
This is pretty much the exact team of X-Men I used to annihilate the Avengers. If I had the duos of Rogue/Gambit or Colossus/Wolverine I would probably have used them (cause the are both pretty good), but sadly I don't.

This thread has gotten hijacked by 2000 point builds now, sorry OP. Have to add my own, though. This version has more in the way of support powers and makes use of some oldie but goody X-Men:

123 Prof. X (GSX)
103 Wolverine (GSX)
110 Cyclops (GSX)
74 Psylocke (GSX)
86 Nightcrawler (WoS)
66 Armor (GSX)
128 Rogue (GSX)
297 Phoenix (GSX)
140 Cable (GSX)
40 Cuckoo (MU)
40 Cuckoo (MU)
40 Cuckoo (MU)
86 Storm (GSX)
100 Bishop (MU)
44 Havok (MM)
59 Karma (FF)
107 Emma Frost (MU)
86 Archangel (GSX)
86 Phoenix (Rachel - ULT)
66 Longshot (MM)
73 Beast (MU)
44 Gambit (XP)

1998 points.

How many actions per turn is fun in a 2000 pt game?

I think my friend would take an hour per turn with 20 actions.

We cap it at 10+ Leadership.

In my X-men Vs Avengers game, I think we decided on 8 actions per turn, which meant very little on the Avengers team turn cause they almost all had the Avengers TA.