I went with Silestone when it first came out. I LOVE it and am so glad I spend the money. I cut right on it, put hot pains down and don't worry about a thing. Mine is man made quartz so it is very uniform. It goes by sq. ft so you would measure the total counter space and go from there. Lowes and Home Depot usually have the price per sq ft on their site.
I looked at Silestone at Home Depot when we were rebuilding (all our material and appliance purchases were thru HD, except the fridge) to be honest I did not like the color choices they had at all, it was all very ugly imo. We went with granite, I cut on it, I put hot pans on it, I don't worry about a thing either.
OP I highly suggest shopping around, we went to several different places and had quotes ranging from $50 a sq/ft to over $100. We ended up finding exactly what we wanted at a granite warehouse many miles from home, we were worried about getting it here and getting it installed, the contractor wanted over $20,000 to get the granite and install it!!!! We said NO way and hired a sub-contractor for the granite & tile work. In the kitchen we got yellow tiger skin (they also have white tiger skin, the same granite only yellow has a yellow base and white has a white base), we have 3 counters in the kitchen area, 1 with the sink (double sink), 1 with the stove and fridge, this is on a diagonal wall so they had to cut some interesting angles and the bar counter as well. We went with rounded edges and we got a tile backsplash behind the stove and along that wall. We also had the sub-contractor do the granite counter in our master bath, 2 sinks, it's a very long counter and they did the tile work in the master shower and they did the floors in the master bath as well. We went with Travertine for the master tiles and floor. The bathroom also has the same diagonal wall so the floors were not easy to do, the shower we did 12x12 tiles up to about 5 feet, then a border and then tiles to the ceiling but on a diamond pattern. The total for all that work, including the granite slab for the bathroom (the sub-contractor couldn't get the tiger skin but they did go pick it up for us, 3-4 hour round trip!), $5500! Definitely shop around, definitely pick your own slabs as well, there are a lot of variations in granite and if you let someone else chose your slab you may not like what you get. It's very very easy to care for, I got a kit at Costco back when we did our rebuild (almost 5 years since the fire now) and I still have that kit. I use water mostly to clean it, sometimes vinegar, sometimes the kit from Costco, it's very easy to care for and the one time it stained (the kids left a popsicle stick from a red popsicle on the counter and it stained) I cleaned the area and just left it, the stain simply faded away and it now completely gone.