With tip rocker the Justice skis a little shorter than the actual length. If you'd buy a Zealot in a 172 then there's no reason not to consider a Justice in a 175. A 3cm difference wont amount to anything after two runs.

Look at the new Line Pandora -- you can get the 172, and with the early rise you will be in hog heaven.

I demoed these in the 182 length last winter, and they were fantastic. I thought they'd be too much to handle, since I'm only 150 pounds and 5'9", but in the deep powder it absolutely wasn't an issue. One thing that Alexander mentioned is the turn radius. I really only used them on powder days, so when I get back on the groomers I just want to bomb back to the lift for another run, but they really don't turn on hard snow very well. In the deep stuff the rocker punches it through the turn quite well, but if you're on harder stuff, no such luck.

The Line Prophet 100s come in a 172 length. They won't give you quite as much float as the Justice and aren't rockered, but are definitely stiff and can handle high speeds and groomed runs as well as pow and crud...a little more of an all-mountain ski. They have a short turning radius (17m as opposed to the Zealots 33m!) which I like for tele, allows you to make quick turns in tight spaces...