-facepalm- what would you recommend I put that point into? Currently thinking Reaction, strength, or Body.
Reaction. It gives you a solid 10 dice Defense pool, which is pretty much the best you can get if you're hard-capping an attribute that's not a dodge attribute (which you usually are unless you're a rigger or an Intuition-tradition mage).
Strength is the second best. Since you want to mix it up in melee, that gives you more melee damage. Also, since you're at 3 Strength, you're only one point away from adding a point of Recoil Compensation.
The difference between Body 3 and Body 4 isn't big enough to consider here. It basically lets you soak a bit better and resist some things a bit better, but it's not really worth it.
Also, at this point, I'm contractually obligated to ask if you've considered combat-enhancing drugs. Given the background, I could see a Narco treatment in your past to make Charisma-affecting drugs more effective. It's just a little dip and a slide over to some Cram, Jazz, Kamikaze or K-10. Take some pharma-grade Cram and Psyche with a Narco treatment and you'd be rocking a 14-dice dodge pool for 7 hours a speed-ball dose - not to mention getting +2 Logic just for kicks.