Don't know of any stone suppliers in the West, but just to say that marble is NOT a good idea for a kitchen worktop as it's far too porous and would stain easily - a nightmare to maintain. There is a home/interiors magazine based in the West which you would find in a newsagent - cannot think of the name of the mag at the moment. Have you tried looking at the ads in any of the all-Ireland interiors magazines or even newspapers?
Personally, I have a granite worktop but although they are durable and stain resistant, I find I'm constantly wiping and shining it and even a drop of water detracts from its appearance. If I could afford to replace it I'd definitely go for a light-coloured composite (Corian)
Good luck with it.