try Line6, Presonus, Focusrite, Tascam or M-Audio. Pag multitrack definitely mahal. 15k pataas.
Kung used, marami sa Classifieds: Pro Audio section.
Ako gamit ko Digidesign 003Rack+ Factory for my MacPro 8-Core Nehalem (Mac OS), then Line6 UX8 or Digidesign Eleven Rack for my Mac Mini (Win OS Bootcamp).