For the record; This should have been a question asked in the forum, not a blog entry :)
Forum = Questions
Blog = Something you want to tell
It is to make it easier for other to find the info later, because in forums things are organised by topic etc.
How many servos do you want to use?
Lynxmotions SSC32 looks like an excellent and powerful controller, can do group moves and speed matching etc and can drive a ton of servos. I linked the PDF, its a good read.
Devantech 21 servo controller.