Live internet show

Hi,

I was approached to start a live weekly half hour internet show, it is a QVC style shopping show with 2 host selling about 6 items per show.

I need a detailed equipment list to make this show a possibility.

The show will feature:
- onscreen graphics and info about each product.
- live feedback to hosts ears as to what is selling well etc.
- cut to pre-excising product shots.
- live questions over the phone.
- fielding live email or twitter questions.

Equipment I have:
- 2 HD cameras
- 2 lavalier mics
- 2 MacPros
- Full lighting kit

Things I know I need:
- ability to tap hosts into phone line
- ability for director to talk to host and camera ops seperately
- mixer for 2 cams, audio and 2 pre-recorded feeds (possibly graphics on mixer lever)
- a great option on computer side is BoinxTV which I will do some testing on
- output feed from computer to encoding box???
- encoder to streaming server

If there is anything I am missing please fill me in as well as giving me ideas on specific equipment models that you have success with.

Your help will be much appreciated,

Chad
greenchad4@gmail.com