Good choice. I also agree with the guys regarding the options to put a LED drop-in in one too. But SF's incan p60-p61 bulbs are fine too. I happen to like my Z3 with a M2 shock absorb bezel on it and it still has an incan bulb.
Reason I seem to like the black finish is due to a no snag stuff-it on clothing with the smooth bezel's HA ll shiny-like finish. The 3 cell is the little brighter especially with p91. The extra lenght lends for a quick stuff it right under your belt at your belly area. Keep your shirt tucked in. This makes for slick quick one hand free up for either a mag change or otherwise fast one hand free up while still holding pistol.
Personally, I can't say much about holster stuff. The holster choices I have seen so far, really aren't much to mention, needing something that can hold it and not have it get hung up on the rubber grip ring.
I have a V21? ... 0r is it V20?. Whichever part number is SF's hard plastic holster for mine. It is short though, and so I really don't use it for my Z3, tried a few times but it sits now. The 3cell is a bit longer than the Z2, and so can fall out while running. Usually my light sits ready in a left back pocket (i'm a righty) and the lenght helps with grabbing access. No LEO here, just practice at action range.