Thwen why spend $130 on either of these when this will do what you want for now??

http://www.hobbypartz.com/thac6smbachw.html

The only way to shorten lipo charge times is to charger at higher than 1C charge rates and you can't do that unless the lipo is capable of charging at 2C and the charger is capable of high charge rates (2C for a 5000mah is 10amps). None of these 3 chargers will charge at 10amps. The fast charge option or mode on some chargers for lipo just completes the constant current part of the charge giving you about a 90% charge. That part of the lipo charge sequence is the fastest.