assault cannon.

Ranged Combat: Stalker Bolter, Sniper Rifle
Mele Combat: Chainsword, Power Sword

For ranged weaponry? Either the new Grav Weapons or the Combi Weapons, especially Combi Plasmas and Combi Meltas, which give you the best of both weapons.

Melee? Lightning claws or power swords, quite simple.

(I will also smack anyone upside the head that says 'vengeance launcher')

Yeah but, the Manreaper is used by Chaos. I am after a Scythe of any kind that loyal Space Marines use.

Anything plasma because when I roll a one i'm probably gone yolo right

duel power claws.... nuff said, or maybe a power claw on one hand, and power fist in the other.... but that would be too complicated, ill just stick with duel claws

The Black Sword, and a my trusty Master-crafted Bolt Pistol

A good old Bolter for me.

A crozious with a powerfist in the other hand, also wearing a jump pack.

Just a heavy bolter for me.