I'll go with modular brain, so I can insert and extract memories, new abilities, and I'll be able to access my subconscious at whatever time I please.
I'd go with a skin-like alloy in lieu of skin, when hit with force, it instantly toughens up, and it will normally act flexible like skin now.
And I'll finish with a minifridge inside me. Why would you skip out on the best part of food, the tasting! Actually, my brain's new mods could do that for me.
So I'll go with an all-around increase to my physical strength. Maybe 60%, nothing inhuman, these abilities need to go under the radar. And of course with my new brain, I could push my body to it's actual limit, so I'd expect a net strength of 190% of normal.