DRT ammo=exotic ammo. Very expensive and probably as effective as Glaser crap. Thre was a police report where a man unloaded a whole cylinder of Glaser silver into the guy, the guy ran off and made a formal report to the police BEFORE admitting to the hospital.
9mm you say? Easy! If you handload, the sky is the limit. A very fast, but light projectile would be great. I am thinking of maybe a 102gr. Golden Saber going about 1400 fps. Would fragment inside the guy and ruin his day.
Also, any of the Corbon stuff is great, but low penetration stuff like their 90 grain and 115 grain stuff. The 125 is great as a carry load, but could penetrate due to weight. The Corbon stuff is loaded with Sierra Powerjackets, a bullet design from when bullets didnt go that fast, so they open quick and have weak jacketing (Noslers on the other hand, open up, then fold back into a bullet and keep going if you get them fast enough).
147 grain stuff seems to do great on the street, but may be heavy enough on a smaller dude to overpenetrate.
Biggest thing is to not compensate for lack of training with equipment. Train in shot placement, use the appt as concealment. Someone breaks in, have those lights off and make as minimal of a visible target as possible. Just the gun and one eye should be around that corner (slice that pie, I like em Cherry).