A HDV camera / VCR connects to the OC just the same as any DV camera / VCR, the data rate is the same due to the MUCH higher compression used in HDV. Once it's captured comes the hard part, the CPU load in decoding a ntaive HDV stream is very high.
To get around this most solutions encode the incoming stream to a more efficient codec, several systems are already available, the Aspect HD solution is available in beta for Vegas, Canopus have a solution for Edius Pro that uses their HDQ codec, that's a fairly expensive path to go down though.
The differences between the pro and consummer camera are well documented, if you're serious about your intent and given the costs involved why are you even worrying about the few extra dollars for the pro camera? IF you really want to shoot anything in any medium that's going to look half decent on a big screen then that sort of money wil be what you spend in petty cash each day of the shoot.
If you want to project HD onto a big screen, last time I asked, a HD projector was $4K per day to hire, you need two strong men to pick one up!
The reality is the costs of some of the components are coming down and this brings it within reach of more people but at the same time, good lighting, talent, makeup, camera ancillary gear like dollies and cranes are still the same price and once you start shooting HD you need good kit, a little wobble you'll get away with on a little screen but not on a big cinemas screen. Same goes for audio, what sounds OK on a TV is unacceptable through a theatre sound system.
Bob.