All VRS application through web making VRS call, Sorenson EnVision SL, and of course NetMeeting are compatible with Logitech Pro 4000, thats the most VRS vendor recommend this kind of webcam. However you'd need to look at any brand which is far more expensive around 100.00 would give you the best clear video quality than cheap brand at 20.00 nowdays, but I can't quarantee you other than Logitech Pro 4000 would be compatible with VRS vendor or Sorenson SL EnVision which Logitech Pro 4000 is aboslutely compatible with all VRS applications. Is reason I say that becuz most of time VI will not process the call due the fact cheap brand webcam is not good video quality as clear.
I wouldn't able to determine which broadband would work the best for your VP since you didn't tell the location whereabout you are at. I would have to look into company's broadband, availbility in ur location and etc for further info if they use PPPoE, PPPoA, or Bridge then I'll can explain to you the fact..
Michael