I'd go for the TD-4 over the HD-1. It's got much nicer rubber pads for the toms than the lite in my opinion, comes with a stand alone kick, nicer rack and it is only a bit more in price. The TD-4 supports the VH-11 hi-hat, which can be a nice upgrade if you want a more realistic feeling hi-hat. The TD-4 also has 1 extra input which can be used to add another cymbal or connect up one of Roland's 3 zone rides. There is a lot of praise for the TD-4 on some of the v-drum /e-drum specific web forums.
You also might consider picking up the older TD-3 as some places might be blowing them out with the TD-4 replacing it. I've seen TD-3s in the high $700s recently, with new TD-4 kits advertised around $995.
One thing to keep in mind is you will also likely need throne and kick pedal with the TD-4. With HD-1 I believe the kick is just a simple floor pedal as opposed to the KD-8 kick pad in the TD-4 (kick pedal not included).
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