i believe that many of the current rubber coatings are not a durable solution for handle material. theyre also a lot harder to clean, and tent to attract dirt and crap that will make them wear even faster.
however if you are determined to get one, i seriously suggest going into a large knife store and actually handling it as opposed to just basing your decision on a short text description. a handle made from a silid rubberized material or with a thick rubber-like outer layer is different from a lot of the cheaper rubberized 'coatings' some plastic handles have, and these will wear off and look/feel like crap. if its coated, dont be afraid to rub/pick at it a little with your fingernail to test the durability of the coating. i was shopping for a pair of binoculars just the other week and i did this with the coating on a display model and it came off easily - this is not the type of material you want on something you are going to subject to use.
also if its a hard use knife, and appearances dont matter much, consider that you can customise many of your current knives if you wish. pull a rubber tube such as a bicycle inner tube over the handle to add a rubberized grip feel. ive done this on a few of my hard use knives - first i epoxied some thicker rubber onto the handle to change the contour of the grip/thicken it, then pulled a piece of bike inner tube over the whole thing to finish it off. worked great.
cheers,
-gabriel