adam 
  wrote:
.... i mainly interested in 1U rack space 
  units since my anvil rack space is limited...
   
  well, the music industry hasn't 
  much to offer as in 1u rack mixers with a lot of channels and - even more 
  important - *aux* lines ...
  two units you may find used, 
  because they're out of production ( .... why ?! ): 
   
  Rocktron line mixer ( 12ch / 4 aux 
  )
  Passac line mixer ( 8ch / 2 aux ) - 
  ( the one Torn used on the "Painting with Guitar" video ... )
   
  you may also check out the website 
  of "Nobel's" ... they offer a bunch of tricky boxes for almost every kind of 
  connection.
  once they also had a liner mixer, 
  but I don't know if they still make it.
   
  if you find out about some thing 
  that's still on the market, I'd be happy to hear about it, either
   
  cheers
   
  Leander