We got the 61" dlp - HLS-6188. I think the difference between the 6187 and the 6188 is that the 88 has an extra hdmi slot and it can do PIP.
We ordered it off the internet from TriState (it had the cheapest price according to pricegrabber when we ordered). They shipped it freight, and were great to deal with, plus it came a day earlier than it was supposed to.
I messed with it a bit, but didn't calibrate it properly yet - just used some resolution settings that I found on the internet. I highly suggest doing at least that, because the preprogrammed settings for the tv don't exactly show how great the picture is. I was a little let down when I first saw it out of the box, but it looks great now.
We don't have any shutters on our windows yet, and although the room isn't super bright, its not exactly dark either, but the picture is still highly visible.
I was just using the cheap component cables that came with our cable box to watch cable for the time being until I'm completely moved in and hook up my proper equipment. It did quite well with those tho, nice colors and crystal clear hd channels. The sd channels weren't exactly great, but still watchable and the picture stretching looks pretty good as well.
I haven't tried hooking up a computer to it yet, but plan to in the future. I heard that the samsung does a better job with the computer connection than the sony's. All in all though, its a great tv so far, and I'm quite pleased.