The multi arm tables mentioned above are great.But consider ultimate expense of two or three seperate arms versus VPI which has quick change of and arm tube for a different cartridge (I use LO MC and higher output MM mono).I know one guy who did both.He bought VPI but then made his own plug in basses that were attached to two arms which had carts matched up to two different stages.Nothing can beat ease of using multi arm but it's the more costly option so figure what you want and use that determinate.For me ultimately less spent on multiple arms meant better stage and Cartridges which IMHO can outweigh deck/arm combo as influencing the sound.
Cheers
Chazz
Cheers
Chazz