Please let me know if any of the above mentioned Sound Cards are available at any vendor.
depends on the kind of work you want to do. For media processing try creative audigy ZX series. Known to work on linux (please check alsa matrix for exact models). Also, have a look at M-audio series. Some M-audio cards are superior to Creative. M-audio is easily available in Mumbai. (I procured one about a month ago from Mumbai). regards VK -- http://mm.glug-bom.org/mailman/listinfo/linuxers
