Unfortunately I have no other choice since my projector and AV processor/amps are all obsolete with component and DVI only, and I don't think I'll change both the projector and amps anytime too soon since they are bought new 3 years back.
You should be able to use an HDMI>DVI cable, like this one, and you may be able to get the upconversion that way - check that your DVI input on your projector is capable of HiDef.