Gigantic even by comparison with the largest Beats headphones, Spider International's Moonlight Studio Monitor ($350) is a deluxe pair of over-ear headphones -- the young company's "flagship" model. Made from aluminum and black plastic with oversized memory foam/leather pads on both the earcups and headband, Moonlight ships with unusually separated left- and right-channel Kevlar cabling, with a 3.5mm headphone plug that screws into an included…