Alright, alright.. 40 K Space Marine armour, that should.. Well, realy be enough to survive just about anything.
Weapon, a bolt-gun, a high-automatic weapon that fires small rockets that implode inside an enemy? Count me in! (Bayonet please included, preferably a power-bayonet!)
As for vehicles, clearly a Land-speeder. Those things zip past any current-day technology we have, and ontop of that, they've got an attached multi-melta that could very easily burn through just about any material known to man, as well as automatic gun turrets. (They aren't big, so it counts.)
The 40 K power armour, would as well keep pumping nutrients and combat drugs into my system to keep me wide-awake at weeks for a time without my sanity suffering from it.
.. Seriously, there's not even really a challenge anymore now, is there?