Nills are nice, but way to pricey IMHO.
I tend to prefer G10 composite grips such as those from
VZ,
Mil-Tac and
Larry Davidson.
If you want some sharp looking wood, you should check out
Sarge's grips,
Grips by Esmerlada and
Ahrends.
For other synthetics, I prefer Hogues for a 1911, I like the texture of them better than Pachmays, but for revolvers I like the Pachs, I don't know why exactly, but that's me.
I had some "Ranger" grips (half checkered) from
WoodGrips.com that we're pretty nice as well.
If the price of the Nills didn't scare you, also check out
Wicked Grips.
I've had Hogues, and various wood grips and some micarta and G10 grips from VZ and Davidson, as well as a couple pairs from Wicked and I prefer the VZs.
When it comes to the VZs etc. the micarta is somewhat porous and looks like crap when the get sweaty if they are a gray color, the black ones are OK. VZ also has a wider selection of patterns available, my next set from them will probably be of the
Elite Tactical Carry variety.
Here's some pictures.
Davidson (Monkey Grips) Red/Black Horned Lizard

My Wife's Pink & Gray Box Elder Burl Grips From Wicked Grips.

VZ Black Desert Sand Operators, a Christmas Present from the Wife Hence the Wrapping Paper

My WICKED LAMINATES Bloody Basin Jasper from Wicked Grips
A word of caution on the laminates, they are very prone to cracking if you over tighten a grip screw.
VZ Gatorbacks in Black Paper Micarta

Maker Unknown
I found these on a rental gun at a gun range and was able to trade a pair for them, again these were for the wife.

From left to right: Pierce Rubber Grips on Kimber Stainless Ultra Carry - VZ Black & Gray Micarta 320s on Kimber CDP Pro II - Ranger Grips from WoodGrips.com
Of them all I like the VZ grips the best, they aren't outrageously expensive and seem to have the best fit. I really liked the texture of the 320s, but up until recently they weren't available in G10, as they are now available, I want a set but I am thrilled with the Operators, I was worried that they would be too rough on the hands, but they don't bother me and are very, very, "grippy"