As you can see, lots of good chargers these day to choose from, these days it's most important to know what you really want in a charger.
1. Compatible Cell Chemistries
2. Max Charge Rate
3. How Many Cells
4. Maximum and minimum physical Size of the cells you need to charge.
5. 12V input OK, or do you prefer USB for connivence.
6. Integrated battery analyzer?
7. Other special requirements?
Thinking about these points, and probably a few I forgot like ergonomics/ease of use, can help you get the right charger.
Since you said you might settle for 2 cell charger, I'm liking the look of the MiBoxer C2-4000 right now. On paper it looks really good. If it was 4 cell I'm sure it would be a hot item, but currently the companies 4 cell chargers don't have a good test/analyzer mode. Check HKJ's review of the charger first, I have not had a chance to play with it myself, just too many other chargers to play with these days, but I'm looking forward to spending time with it. Lots of other good suggestions already mentioned.