I got the Harmony 670 for Christmas and it is awesome! Super simple to program and customize - burns through batteries as noted, but I just picked up a bunch of the 15 minute charge ones and it is not a problem.
Logitech has good customer service as well - the screen stopped functioning (think the kids dropped it) and they sent me a new one by DHL within a couple of days.
Other stuff in the home theater:
TV - Vizio 50" Plasma - Couldn't beat it for the price ($1499) - picture is great! Also has 2 HDMI ins which came in handy. Remote sucked - plan on getting an all in one if you don't have one.
DVD - PHL DVP5960 Philips Up convert DVD Player with HDMI - Bargain at $60 and I don't need to worry about the format war going on.
DVR - Scientific Atlantic Time Warner box with HDMI.
Stand -
Techcraft Plasma Stand - Sturdy and lots of access in the back to wire things up.
Surround Sound - Sony Home Theater System (HT-DDW700) - This was pretty cheap at $180 but sounds good and is plenty for my space. The speakers are pre-wired and the sub isn't powered, but overall a good starter. I did spend quite a bit of time and bought good speaker wire and fixtures and ran the runs from behind the home theater to the back of the room through the walls so I can upgrade the system in the future and don't have any exposed wires.
Games - Regular Xbox and Wii with Component cables. Love the Wii - Wife, kids (3 and 4), and I have a ball with bowling.
I got everything except the remote and Wii at thanksgiving. I am not sure why I decided to replace everything I used to have, but it was fun doing it myself, not too expensive, and it is plenty for everyday TV with the occasional DVD marathon.
Orange