I would highly recommend going with the HL67A750. It is really a no brainer. You never have to replace any lamps! The color wheel is a moving part which will also wear out and need to be replaced. The 750 has superior color fidelity, and once properly calibrated it will never have to be recalibrated since the colors don't degrade over time, as with lamp-based models. It also consumes less energy, makes less noise, etc. For more information see:
I have had one for 6 months and I am extremely happy with it. It is a tremendous value for the price.