To carry: I like knives that are small, slim and light enough so that I forget I am actually carrying them until I need them. 2 of the best for this purpose are the Kershaw Leek, and the SOG Access card 2. Just slip em in my pocket, and forget about them.
To use: I love checkered Kraton handles. Cold Steel and SOG are the masters at this. It makes the knife feel like a natural extension of my hand, with a very positive, no-slip grip, and they are hands down the best shock-absorbing material ever used for knife handles. If I had to pick one in particular, the LTC Kukri by Cold Steel is perfect. For such a big blade, it is light, quick, and very 'responsive' in the hand. At least for my hand, the contours are perfect, as if it were custom molded to my specifications.