ok ill set mine up in catagories because i think we all know that theyre are probably a bajillion things we want from Halo universe. I mean get real... you cant seriously choose just ONE!
Vehicle: i would either want a pelican, hawk, warthog or ghost
Weapon: Sniper rifle or battle rifle
Explosive: Plasma grenade DUH!
Pet: I think a sentinel would be cool
Building: Space Station.... epic MAC cannon to blast people i dont like lmbo and zero-g parties in empty hangers!
Equipment: Either a cloaking device(epicness) or a grav lift...
and although this doesnt fit in a catagory... i would like the spartan augs. being 7' 2" with super jacked muscles, a brain like a nerd while still being cool and being a master of war is prob. the most epic thing.... ever... and ever... and ever...