We replaced the formica countertops on our '00 Bounder when we bought it.
We originally wanted Corian that matched the existing marble looking formica so that the tables would match, but we would have had to purchase a whole sheet. We saved money(almost $400)by using some that the countertop guy had left over from another job. It doesn't match the table, but it's the right color to blend with the rest of the interior.
Funny thing was that we went to an RV show a few weeks later and almost all the new RVs had countertops that matched what we had ended up with.
As it turns out, the fact that the table is different from the counters isn't that noticeable anyway.