I went with the Magpul K2+. It has a softer feel and a more vertical angle.
I like this one too. Here is where you can get it: Hogue OverMolded Pistol Grip AR-15 RubberI like the Hogue grip myself.
I like this one too. Here is where you can get it: Hogue OverMolded Pistol Grip AR-15 Rubber
One caveat on the Hogue grip; it's really grippy. I took a rifle class not long ago and it was quite hot. The rubber does a fantastic job of providing grip even if your hands get a little sweaty. Unfortunately, after a lot of gun manipulation over 4 days, my shooting hand got a little red in the webbing between the thumb and forefinger.
For most of your shooting this won't be an issue. I just wanted to mention it.
I found the exact same thing with my Hogue. I was really kinda put off about it, I really wanted to like the hogue, and did, until I spent some time with it. It became so grippy, it was almost sticky.
I felt like every time I let go that I was getting sticky residue on my hand. Of course, I wasn't but even now, when I pull it out of the package I remember how that felt. I kept throwing dust on my hand before manipulating my rifle in scenarios. Dude asked me if I was "chalking" the bat! HA.
Really though, for me it was really nice until a little more use that a simple range trip. I recently bought and installed a BCM 3 pistol grip and won't look back. I still love the way it just fits though.
BCM Gunfighter 3 pistol grip is nice. Very nice. Really nice. Its good.
This is the one I'm going with and I recommend it as well. I got to hold one on a rifle and could not believe the difference it made with a different angle vs the moe maid grip. Also the + is rubberized like Mark said. Super nice grip!!