Need Camcorder help!

Hi i’m looking at getting boinxTV but i’m very new to all this so i don’t want to spend $1000s on a camera just yet. i’ve been looking at the HDMI ones and theres plenty around for reasonable prices my only problem being i have a 15inch macbook pro with thunderbolt so i know i need a HDMI interface, i’m just not sure if i’m looking at the right thing? This is what i’ve found on Blackmagic, am i looking at the right product? (the thunderbolt one obviously!)

Thanks from an absolute noob!