3 Devices plus interweb.
I would work it out roughly like 3xstreaming HD max 15mb per device plus interweb maxed at 40mb = 85MB (plus overheads will be closer to 100MB)
you kit does 200MB so you will be ok. the only real reason to change woll be the overall ma through put if you are moving large data about. The higher bandwidth stuff though has its own issues as the higher the bandwidth the less tolerant they seem to become.
but in all fairness I would probably not be able to resist buying something that should be better