Forgot to mention if you don't have a problem with used equipment you can look for an older Cellpro 4 charger. I have a few of these and they are a simple to use lipo charger and they do a great job of charging, storing, and maintaining lipo packs. You can usually pick them up for around $25-35.00 and they will only charge 2,3 and 4 cell lipo packs.
I have used Gens Ace lipos from Hobbypartz and G-Force lipos from Value Hobby. Both are very good in my opinion and when I order more it will be the G-Force from Value Hobby.