I have the 970 and feel your pain. I too wish that the inputs were assignable, but they aren't. My TV has 1 HDMI and 2 component Video hookups. Basically you will need to decide to use DVI or Component. I use a Toshiba HD-A1 and PC on the DVI inputs and have my DVD Player and HD Cable wired directly to the TV via component cables.
I can confirm that the DVI works for 1080i on HD-DVD, but my TV will not accept 1080p so I can't vouch for that.
What I did for family simplicity is get a Universal Remote. I use a Harmony and it is the best purchase ever. When my wife hits HD-DVD on the remote it sets the Outlaw to the correct channel and sets the TV on the HDMI input. For Cable it sets the outlaw to it's input and changes the TV to Component 2.
Hopefully the good folks at Outlaw are listening and will give us 5 HDMI inputs on the next generation product.
Good Luck,
Charlie
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Charlie,
Outlaw 970, B&K AV5000, Paradigm Ref 20 and CC (V1), Martin Logan Dynamo, Sony 42" RPTV, Toshiba HD-A1