STAFF PICK: Five years ago an electronics store miraculously appeared, rescuing Tucson from the evil clutches of a lack of choice. The construction of Best Buy provided those of us with a modest budget the capability of buying top-of-the-line products at sensible prices. Before 1996, opportunities of shopping for TVs, VCRs, computers, stereos, video tapes and other luxuries were limited. But now we have Best Buy.