don;t let bad info in this thread confuse you. The wiki link explains this, but you seem to already understand. HDMI 1.4 is absolutely required for plug and play 3D from consoles, set top boxes, blu ray players etc. 3D "ready" projectors work on 1.3 by acting as 120hz frame seqential displays, not using frame packing or other 3D encoding formats of 1.4. They work great with PCs, but not PS3. You can use 1.3 CABLES for 3D.
No projector "requires" nvidia drivers. Nvidia has a limited number of displays it supports
. And you have to pay for the 3D support (or hack it with enablestereo.bat). AMD HD3D is free, as long as your card is newer. 6500? Check their website for specs.
the gt750 is the only option near your price. Acer did release a 5360BD, but not in the USA. One major concern with the 750 is slow color wheel if you are bothered by RBE.
What are you planning to use the HTPC for? Are you going with DLP-Link or IR/emitter glasses?
honestly, if you are going to spend 6-700 for outdated projectors+adapters, consider the benq1070. it is better in almost every way except price.1070