I have a 55gal that is not predrilled and cannot be drilled, but I like it very much!!
That said there is nothing (except maybe lighting) that will affect the way you reef more than the size/shape of your tank. $200 does not sound like a once in a lifetime deal, unless there are more components you have not mentioned.
If you are not set on the size shape and are just worried about letting a "good deal" go by, i'd pass. There are plenty of fish in the sea, lol. See what I did there?
Good luck!!