I've found the UW 155 grain TMJ to have a lot of kick out of my G29. Happens to be the cheapest UW round also. Don't forget to use the 5% off coupon code posted on the forum.
The 155 grain is #1 in muzzle energy, and #2 in velocity, second only to the 135 grain screamer.
Here is some great info by DRSJR1969 who measured a bunch of different 10mm with the chrono.
I don't know if I mentioned this but I really like the 155gr TMJ. Just saying.