asterisk users - Nov 2012 - Inexpensive SIP Polycom conference phone?

Hey, all.  It seems that Polycom has a bunch of offerings for 
conference phones, and I'm just wondering which are the less-expensive 
alternatives; what with their marketing, etc., it's not always obvious 
which is which.

Thanks,

-Ken

P.S.  If anyone's had really good experience with another vendor's 
(relatively inexpensive) conference phone, I'd also be interested in 
hearing about that.

-- 
This mail was scanned by BitDefender
For more information please visit http://www.bitdefender.com/links/en/frams.html