I know this is very late, but hopefully Jim will see it, if nothing else someone else may see it in the future.
When dealing with Simulcasting live events, you are going to need to get into Professional Cameras, Switchers, CG/Titlers, etc.
In this day and age that means you will most likely be dealing with HD-SDI.
Everyone you will talk to that is running multiple auditoriums right now will be running SDI (either SD or HD depending on the age of the installation).
The good news about SDI today is that you have a wide variety of options to do almost anything at a variety of price points.
For SDI time delay (DVR) functionality we have two options.
You could run a Doremi MCS or GV Turbo2 (I believe the Turbo2 can play while recording, I know the MCS can) which are your traditional "professional" multi-channel video servers.
Your other option is to run some software on an appropriate computer. The most stable system I have had the pleasure to use is by a company called Softron. They sell and injest and playout system that runs on MacPros using Blackmagic Hardware. It will scale from ~10 seconds of delay to hours.
A setup using MovieRecorder and OnTheAir Video with a capable MacPro, Blackmagic Cards and a few tweaks (we like to see SSD's over spinning disks when possible on these types of systems) will only run you ~8000.
You wouldn't want to use a consumer DVR for all the overlays it has and lack of support. Live time delay systems affecting an entire sub-set of your audience is not a piece of equipment you want to be left alone support. You will also want to be using professional (SDI) formats/interconnects so that you could rent in equipment easily if needed.
For the cameras, check out Panasonic's new Camcorder Studio Systems in conjunction with the AG-HPX300 or 500. Less than 40K for lense through ccu including a basic pedestal or nice sticks.
Panasonic's switchers with built in multi-viewers are also very competent for the price.
Hope this helps someone,