It all depends on what specifically you need. If you aren't planning on mounting it to the wall, you can get a bigger dlp for the money of a smaller Plasma. The plasma picture is sharper, but how sharp do you need it? My 56" Samsung DLP is only about 12" thick and the picture is only slightly less sharp than a plasma. IMO, hardly enough to tell. Take a look at both side by side and decide for yourself. I was looking for size because of my living room, so I went with the DLP. The Samsung DLP is so friggin sharp it's amazing. But plan on getting $90 HDMI cables and you HAVE to get HDTV programming from your cable provider. It's a waste without it. Watching games on ESPNHD is unbelievable on a 56" DLP.
I went with the DLP instead of the LCD. DLP colors are more vibrant, but the blacks are not as black. What do I care about how dark the black spots are?