Hello

at my local gaming club this weekend I'm going to be running (hopefully a few) demo intro games of Epic Armageddon.
As they're the only two armies I currently have that are painted I'll be using my Imperial Guard, and Chaos Space Marines (Iron Warriors).
The games will be 2,000 a piece, using two objectives each. For the time being, no aircraft to keep things simple.
For the Guard I'll be taking a core of 2 Infantry Companies and a Tank Company, plus I can take Sentinel, Artillery, Rough Rider support, amongst other things.
It's the Chaos Marines that are proving a conundrum. I can take two standard CSM detachments, Terminators, Tanks, Tanks and Tanks

But I also have Obliterators and Havocs, I'm wondering if things might be too imbalanced if I take these.
Also, would you include War Engines in a first-timer demo game? I could include 1 or more Warhounds with the Guard and up to 3 Decimators in the Chaos army.
Any advice will be gratefully appreciated!
Thanks
