mine went ka-put yesterday and got to go get a new one pronto, like today. some i saw have vent grill across the front at the top and some do not. is one better than the other? is one brand better than others. they range in price from 200 to 1500 bucks. all i want to do is warm up stuff, make rotel, etc. it is the kind that mounts over the range and bolts into the bottom of the overhead cabinet... any suggestions.