Use a regular 90cm dish, an Universal type LNBF (LO 9750/10600) along with your subscribed Sky Mexico receiver. You should not need a larger dish in your area.
Here in Northern CA, installers typically use a larger 1.2M and North of Chico, CA a 1.8M or 2.4M as we are on the edge of the satellite footprint. You are in a good signal area and do not need a large dish.