re: tonearms, that jmw is supposed to be an excellent arm - i'd keep it. can't imagine why it wouldn't fit on either of these 'tables ewe mention. i know i've heard of *both* 'tables, w/a myriad of arm combo's.
again, re: cartridges - here's a lone woice in the wilderness recommending a used/demo cartridge, especially from a dealer.
good luck, doug