camera and live show help

[yedweeeezy]

So i have an intel based 21' imac that i use for a broadcasting show I currently have a 2 camera setup the built in isight and a webcam, the webcam broke but i did not like the quality anyway plus id like the zoom function which webcams don not have... ive done my research and i believe i need a mini dv camcorder with a firewire output so i can broadcast/ stream live... i know they dont really make firewire camcorders anymore so i was wondering will a normal everyday camera be fine quality wise i know it will already be better than a webcam... or do they make a hd firewire camcorder... if so what are my options or if you know another way i can broadcast please let me know...ps i can found this for 50 bucks Sony DCR-HC28... sorry for the run-on post

 

[yedweeeezy]

trying to do the the least cost effective method as possible thanks for your help