Hi. I have to buy another monochrome laser for our bills etc. Looking at the spec of those on sale, what seems to determine which I buy is the cost of the replacement carts as these range between £10 and £80. I have been caught out before on this factor and am making sure I get one with low cost cart replacements this time. The one I think will be ok has a printing resolution of 600 x 600. Will this produce crisp text and solid black graphics, which is all I want to print with it?