Each person has things that are important to them, and thus, that is the reason it is so hard to recommend a projector. One can not make a decision based on a review, without viewing the projector for themself. For example, I can't stand the image from single chip DLP devices. That doesn't mean you will not like it. I also have issues with (among other things) JVC's color accuracies and inabaility to fully correct it, which rules out their projectors for me. That does not mean you will not like it.
My reference is a NEC 10pg crt projector in my theater (9 inch tubes, 6500K, ISF calibrated), which is being replaced by a VW80 that I purchased.
My point was that he already owns a HW10. The projectors he mentioned will give him incremental improvements over the HW10. The HW10 is no slouch. However, whether it is worth discarding the projector for another is only something he can ultimately decide.
BTW, while "pjreviews" gave the 6500ub a good review (as was the case with the AE2000, AE3000 and numerous other projectors), postings here will show that lots of "recommended" projectors have dust blob problems, stuck zoom lens rings, pixel alignment issues, etc. None of these issues are associated with the Sony projectors.