To record HD premium channels you will need the Hauppauge HDPVR. If you just want the locals, they should be avwilable in clear QAM which you can record with your 1600.
You can input an S-Video signal into the 1600 and record any channel but it won't be great quality. The Hauppauge HDPVR accepts component signals which is the best you can get right now and the only one you'll get all HD channels from your cable box. You can also capture in a format for Xbox which will make it easier for you to stream to your 2 systems. You should check it out before you buy anything.
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