Another fun heavy that may not have been considered: The Shootist.
http://www.sarna.net/wiki/Shootist
Here's the description: 70 ton heavy, ephasis on heavily armored and electronic warfare capable command platform. Armed with an AC 20, an ER Large Laser, 2x Medium Pulse Lasers, and a Small Laser, it has decent hartpoints for the tonnage. Could also be a candidate for ECM on one or two variants perhaps.
Here's what it looks like:
Definitley suffers from the "I'm a BRICK!" syndrome, but I have faith in the design team to make this thing look amazing in MWO.
It's a star league era 'mech, so there is some argument about rarity when looking at the lore, etc.
It does have three variants. However, only the main variant, the ST-8A is buildable at the current time line in-game. Both of the other variants, the ST-8C and ST-9C, use Inner Sphere ER Medium Lasers, and include C3i Computers.
All that said, and while admittedly unlikely, I would love to see this 'mech added as a possible Electronic Warfare platform if we're talking about adding more 'mechs to the game.
That's my contribution, thanks for reading and take it easy. <S>
-Colonel Andrew "Havoc" Davis
Death's Hand Brigade Mercenaries