Are you talking a DLP projecter or an actual DLP television.
Any projector is not going to look as crisp or as vibrant as a screen imo. I saw some DLP TVs when I bought my HDTV last fall. They looked nice, but I do remember they looked a little funny from the side. Not as bad as those old rear-projection models, but it was a noticeable difference.
I got a LG 37" LCD. My 360 and Wii both look great, and even standard definition movies look incredibly better. I've had no problems with it so far, and the only reason I didn't go bigger is because anything bigger would have taken up more space than is in my living room for a TV.
Whatever you get, I'd recommend at least 2 HDMI ports and 2 component video connections. Whether or not it has the standard video/audio inputs is really depending on what you need. I got the LG model because it has 2 of each of those connections, and an optical audio out.
I'd say avoid plasmas. Everyone I know who has bought one has had lots of problems, and they don't fix cheap.