I bought the 73" Mitsu DLP (73c10, IIRC) a few months back. It is a very big television that is pretty reasonable in cost. Dell sells it for +/- $1200. The set has good+ image quality and a lot of sq inches in an efficient cabinet, although it's a little quirky on power up (no signal, followed by the dancing mitsu logo, followed by your picture) and power down (a ghost image lingers for +/- 1 minute).
The 73" flat panel set from ??? that was just introduced is probably better, but almost 3X the cost. It wasn't available 2 months ago when I pulled the trigger, but I'm not sure it would change my mind. DLPs seem to have a life of 5ish years IME, so I put off the bigger purchase til later when the declining tech cost curve should continue to work in my favor.
Marty
PS Everyone I've talked to says the Mitsu Lazer-Vu sets (the only other <$5K option that I know of)look cool, but are more expensive than traditional DLP and glitchier (even tho they were supposed to be more reliable).