I am tempted to use black tiles as the splash back as I may have access to some for free. Bench top is the next big decision
I have seen a few kitchens that have been using 600 x 600 floor tiles for the splashback and only using a 3mm spacer so the grout line is narrow. A lot less grout to clean and gives a sleek look. The standard height from top of bench top to under side of the overheads is 600mm so they fit in without having to do to many cuts. Your looking at maybe 20 bucks per tile so wouldn't be a big expense.