I have seen the cheaper ones listed in here and they do look VERY nice, however I am looking for some features I am not seeing.  Most now DO have the option to go into portrait mode, which is a must, but I am looking for a mount that allows me to change the angle to more than just a very slight arch inwards.  Are there any that are hinged or malleable in some way?  Also that the arms telescope rather than are a fixed length, as width is a issue currently.  I am looking at using 3x Crossover 27 in monitors for this.  I have no problem spending more for something good, but im not looking to blow obscene amounts either.
 
Any input/recommendations?
 
Also, if possible, I prefer it to be the type that clamps to the back of my desk.

I use three of these on a Geektable. You can move them 360 in any direction.

ERGOTRON 45-241-026 LX Desk Mount LCD Arm

http://www.newegg.com/Product/Product.aspx?Item=N82E16824994063
 

 

Thanks all.
 
@ZelmoQuad
That's pretty much what I was looking for, I was hoping for a one piece mount, but in the end I think this would serve me a bit better.