Oach, especially in your rather small listening room, it's highly likely that your 1400 has more than enough power for your setup. Adding even more headroom with separate amps would make no improvement at all; unused headroom is simply wasted. If you have some money that you'd like to spend on AV rather than investing it, why not buy something that'll make a real difference, such as more CDs and DVDs?

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Enjoy the music, not the equipment.