Yes, Nil grips are awsome but come at a high price. As a less expensive alternative, I too recommend Badger Grips. Have them on my Super Blackhawk and used them on a GP-100. Both fit and feel great. Highly recommended.
Suggestion, if you don't like the feel of Hogue rubber grips, try Pachmeyer. They have different series which are smaller/larger so you can get a good fit to your hand. I have a big hand but short fingers. Their gripper pro series on my square butt L frame fits me perfectly. Sorry, they don't look as nice wood but what do you want for $30? worth a try.