I am buying a range to replace a wall oven with a cooktop over set in corian. So I want to pull out the two units and cut the countertop without removing it if I can. I was looking at the Rotozip RFS1000 to do this job but I am wondering if I am going to have a hard time getting a nice clean straight cut using a saw like this? I suppose I could make a partial cut with my circular saw up until it hits the wall, using a carbide blade of course, and just finish it off with the zip saw. Any suggestions?