I've had my HLM507 since mid December and I only have my DVD player and analog cable going into my antenna input.
I have Comcast Cable In the SF Bay area and most of the channels actually look quite good on my set. I'm hoping Comcast rolls out HDTV in my area soon, but in the meantime, I'm quite satisfied with regular cable on my Samsung.
There was a thread awhile back asking what people had plugged into their Samsung DLP. IIRC, well less than half the people has an external HD receiver. Unfortunately, this isn't a true picture at least some people were probably using some sort of HD reciever in the HTPC they listed.
I say go for it all. I bought an OTA set top box when I bought my 617. I also have Dish with a nonHD receiver. All my local channels are into HD (Dallas) and I find myself watching stuff JUST because they are in HD. It is very addicting once you see the quality difference.
Set tops with the cable compatibility agreement features should be out this fall. Cross-channel and multipath problems will be better dealt with too. If you're not in a hurry, you might want to wait until fall.
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