Professor X 131 pts. + Compel 15 pts.
Gambit 90 pts.
Wolverine 71 pts. + Auto Regen 12 pts.
Cyclops 50 pts.
Jean Grey 31 pts.

400 pts on the dot if I'm not mistaken

Move Wolvie out, along with Cyke on the first turn. Second turn TK Gambit into attack range (only after using Cerebo on his attack value) and then attack. After that has resolved, use Xavier to compel him to attack again - and now he's on his nasty defense click, hopefully stealthed. Pusk Cyke to get him to his uber nasty third click.

The rest should be pretty easy!

My absolute favorite is a 599-point "X-Men" keyword team that perfectly matches the Secret Wars lineup:

131 M&M Professor X
100 M&M Storm
95 V (FF) Rogue
94 U (Sin) Wolverine
61 V (FF) Nightcrawler
60 DR Colossus
50 M&M (FC) Cyclops
8 BST Lockheed

It plays surprisingly well considering: no feats and uses only 3 "modern" figures.

The LE Charles Xavier is probably a better thematic (dial) choice for this team, but it's the "Cerebro" power that holds this team together and brings the pain.

I prefer X-Factor with Havok, Polaris, Quicksilver, Strong Guy, and all the Jamie Madrox I can manage (E and V for keyword, with the Bystanders as needed). Best played at 500-600pts. Heck at 600, throw Exp. Rhane on just because.

I'd really like to see the rest of the current team get made though. That would be a heckuva fun team if we could finally get M and the others that haven't even been clix'd yet.

Gambit
Bishop
Iceman
w/ Stunning Blow
300pts of solid fire power and multi target lockdown.
I pulled this team in a sealed game and rocked the place 3-0.
Then again for 4 weeks straight! Constructed. Floor
It's stealthy, it moves, and it packs a double barrell shotgun.
Once owned E-2 Superman in 2 turns without taking a single click.

X-Men Team: 481 Points Modern Age Rules - No Feats
Wolverine 105 (WOS)
Archangel 95 (MU)
Nightcrawler 86 (WOS)
Warpath 70 (WOS)
Wolfsbane 65 (WOS)
X-23 60 (WOS)

I like this one, created by a friend:

Bishop, M&M - 100
Nightcrawler, WoS - 86
Beast, M&M - 73
Marvel Girl or Cuckoo, M&M - 40
299 total

Bishop hits HARD and has outwit after first click, Nightcrawler helps with stealth or other HSS, beast has perplex and is combat capable, and the last one can be either a TK or a PC.

300 pt team
Wolverine 71 pts. + Auto Regen 12 pts.
Cyclops 50 pts.
Jean Grey 31 pts
Nightcrawler w/ Armor piercing 96pts
DR Storm 40 pts
300 pts even

I like playing this 200 point X-men team

NIGHTCRAWLER 86

WARPATH 70

(V) HAVOK 44

200 point total

Havoks leadership helps the teams mobility + he does 4 damage

Warpath has damage reducers stealth and B/C/F. Some late game psychic blast and a cheeky bit of flurry too

Nightcrawler is the harasser and just messes with the opposing team. somone getting too close to havok ?? port'em over to warpath for a lil B/C/F fun

At 200 points i think thats not too bad a team to play competitivly

I don't think these are the "best" X-men teams one could build but I like them and they do ok.

MUTANT
131 MU031 Professor X
124 MU005 Strong Guy
40 MU001 Marvel Girl
295

X-MEN
105 WS043 Wolverine
100 MU014 Bishop
86 WS047 Nightcrawler
291