Well, I also had a Sanyo z4000 which is LCD, not impressed at all. Got rid of it after 2 months due to its grayish black. Picture is dim too.
DLP and the LCoS look are quite different. If you're not RBE sensitive, I actually preferred the HC4000 over the 3800 due to slightly better black. For the money, it's a great alternative to the Sony. However, Sony definitely has better contrast and is more flexible with installation.
BTW, all DLP's are noisy, comparing to LCD and LCoS.
Among the 3 Sony's, VW60 has better optics than VW50 and HW10.
Hope I don't confuse you further.