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Chaos:

HQ - 625pts
Abaddon
Ahriman
Greater Daemon

Elites - 2880pts
10x Terminator Champions w/ Chainfists, Reaper Autocannon x2, Combi-weapons x8 and MoN + Dedicated Land Raider w/ Every upgrade it can take. x3

Troops - 3930pts
20 Plague Marines w/ Everything + a Rhino w/ everything. x6

Fast Attack - 1620pts
20 Raptors w/ Everything + MoN. x3

Heavy Support - 1950pts
20 Havocs w/ MoN, 4x Lascannons and every available upgrade + Rhino w/ every upgrade. x3

Total - 11005

Now:
If you want you can add to that list the following:
20x Lesser Demon - 260pts x57 - 14820pts

To bring the total up to 25825pts, snatching the top-spot and STILL being COMPLETELY codex legal.

Well CSM wins hands down, with infinity points. Gwar! did a post about this ranking each in terms of both max and minimum points cost for each army. IIRC, Blood Angels won.