best 9mm rounds for carbines?

I'm shooting a lot of the Winchester 124gr NATO 9mm ammo out of my Storm carbine, just for the added velocity alone. It's accurate and consistent, clean for 9mm too. A little on the pricey side for 9mm ball ammo though. $12 per 50. Federal American Eagle 124gr seems to perform well too. It's $10 per 50. I'm not a fan of the 115gr stuff in a carbine, for me at least, it doesn't seem to perform as well as the 124gr stuff does.

I've been thinking about one of those sub2000's, how many rounds have you shot through yours, any major issues or problems with it? What's your overall rating of it.

The lighter loads seem to gain more velocity in the longer barrel. Corbons do good.

http://ballisticsbytheinch.com/9mmluger.html