I've been using cheap stones for a long time. I want to upgrade to a good quality set. I'm not intrested in oil stones. I am intrested in water stones as well as diamond. I don't need any super duper fine stones. I do however need a very coarse stone as I have several knives to thin, fix. A few are super dull. Which brands should I look into? Also I need some reliable web sights to purchase equipment. I don't want to spend thousands but I'm willing to invest in some really good stones. Any help would be much appreciated. Thanks.