you can build a simple, but nice looking and strong stand using just angle iron and plywood. use 1.5"x1.5" 1/4" angle. get 4 pieces cut to length, for the height of the table, minus 1.5". Then get 3 panels, 2 are for the sides, 1 for the back. you can add shelves and doors easily if you want, but they are not neccessary. the top should be 2 sheets of plywood cut to size, that are glued and screwed together. laminated, as they say.
everything is bolted together, the panels sit inside the angle iron legs. drill 3 holes per leg per panel, and match drill holes on the panels, and just bolt it up with some nice bolts. the top should be secured using a cleat method, a few tabs of angle iron either bolted to the legs or panels, at least 3.
depending on your required weight, you can also reinforce the top with horizontal angle iron