based on your question, IMHO the best single chemistry charger out there is the TME Xtrema.
http://www.rcaccessory.com/index.asp...rodID=255&HS=1
High powered for a 5S pack. You can even serial them for 10S charging. TME is about to release (I have been Beta testing it for months now) their new balancers for the Xtrema. What is cool is that you will have the capability to hook up 4 balancers to the Xtrema and balance charge 4 packs at the same time. Each pack is opto-isolated from each other as well. Very cool design.
Now if you decide not to get a single chemsitry charger, then the e-Station BC-8 is recommended for 5S A123 packs.
http://www.rcaccessory.com/index.asp...ROD&ProdID=203
RC Accessory, Inc.
Auth US Bantam Importer