I am looking at building my first lower for a varmint rig. I am looking for a good, stable and  comfortable grip. Some recommendations and/or web locations would be welcome. Thanks eagle308us.

I have the fancy adjustable palm swell target grip from bushmaster and I'm not overly pleased with it.  It is textured plastic and fits my hand well, but I think I'd rather have a softer rubber grip like a Hogue.  Plus, the fancy one like I have costs 60 bucks so I would shy away from that.  

If you are right handed, look no further than the Sierra Precision Rifle grip sold by various AR15 distributors and merchants.

It repositions the hand, has increased diameter for added comfort over tiny little A2 grips, has a thumb rest helping to assure proper grip location, and a built up "pad" that helps to place the trigger finger properly on the trigger.    Price is generally around 29 dollars or so.

It however is not an ambidextrous grip.
Some decent close up pictures of the grip can be found here at this link showning the grip on my AR10.
[url]http://home.bak.rr.com/varmintcong/ar10/ar10a4.html[/url]

I second the SIerra Precision Grip.  I have Ergo's on all my rifles, except my SPR wannabe, which has the Sierra grip.