I would go with either two Power Claws for extra Chopping Or with the classy Chainaxe/Plasmapistol hopefully there will be powefull Chainaxes, or I'll have to go with a Poweraxe/Daemonweapon
An autocannon and all the ammo I can carry. Chainblade bayonet and a Legion fighting knife for close quarters work.
I'm an Ork so my answer is simple. A Chainsaw attached to a chainsaw attached to a chainsaw connect to a pair of buzzsaws
I'm happy to introduce you to my chainsword bolter, a bolter that shoots....chainswords, at least your face gets introduced ! =D