Here's my idea for the team...

Bizarro (Unique): 200 points
Desaad (Unique): 47 points
Killer Frost (Experienced): 54 points
Lex Luthor (Unique): 69 points
Poison Ivy (Veteran): 49 points
Ultra-Humanite (Unique): 80 points

TOTAL POINT VALUE: 499 points

Not bad, eh?

I do have Darkseid, Gorilla Grodd, and Sinestro. Making them fit into a 500 point team is tough, though.

Any help would be appreciated...

Was Killer Frost ever on the Secret Society of Super Villains? You may need to replace with a Cheetah piece. Also, wasn't it Gorilla Grood instead of the Ultra Humanite? And Desaad? Try Brainiac or even the Scarecrow would work.

According to WHO'S WHO'S: THE DEFINITIVE GUIDE TO THE DC UNIVERSE, NUMBER 20, The Secret Society of Super Villains was "formed by Darkseid to pave his way for a takeover of Earth...". The list includes...

Angle Man
Bizarro (in HeroClix form)
Blockbuster (possiblly substitute Bane)
Brain Wave I
Captain Boomerang (possibly substitute Boomerang)
Captain Cold
Captain Stingaree
Cheetah (in HeroClix form...Sorry I forgot her)
Chronos
Copperhead (possibly substitute a member of the Serpent Society)
Felix Faust
Floronic Man
Funky Flashman
Gorilla Grodd (in HeroClix form)
Hi-Jack
Killer Frost (in HeroClix form)
Killer Moth
Lex Luthor (in HeroClix form)
Manhunter I
Matter Master
Mirror Master
Mist
Monocle
Poison Ivy (in HeroClix form)
Psycho-Pirate II
Quakemaster (possibly substitute Avalanche)
Rag Doll
Reverse Flash (possible subsitute Flash...although this negates Grodd)
Shadow Thief
Sinestro (in HeroClix form)
Silver Ghost
Signalman
Star Sapphire
The Trickster
Ultra-Humanite (in HeroClix form)
Wizard

Hope this helps...