I need a new webcam, but which?

I need a new webcam, but which?

I'm in the dilemma on which webcam i should buy, and I'm still confused about it.

I've narrowed it down to these three:
Microsoft Lifecam HD-6000
Microsoft Lifecam Studio
Microsoft Lifecam Cinema.

So what do  they all have in common?
They all support the native resolution of 720p, but the studio supports 1080p as well.

Personally I like the HD-6000 for the price, but also the size of it, though I don't know whether it will fit on my monitor. The HD-6000 has a nice LED light around the neck of it, showing when it's live.

The lifecam studio supports 1080p, but also have support for a tripod stand, which would make it ideal for other videos. Though the downside of the cam, is the price.

The Lifecam Cinema is in a price range in the middle. Though, it do not support  1080p, and neither have the the mounting for tripod.

What do I need it for?
- I need a new webcam for my gamestreaming and the upcomming DayZ SA content, as well as I've started a new youtube channel called "Online Economics".

So if  you are reading this, and in the same position, please comment below.