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There are so many options in this range that you need to narrow down price range and what features you want.

If you need something that can power up the phone many times between charges then the Imaxx would be a good choice. If you need something very compact then maybe the RichardSolo or the cheapo ones on Ebay.

personally I didn't want to spend a lot of money so bought a couple of budget-priced options and they work great. I use them regularly.

Here is my review of both of those:
https://forums.macrumors.com/threads/628399/

brad
 
I have the Richardsolo. I think it's pretty nifty. The flashlight has definitely come in handy. I don't like how it won't clip onto my Seidio innocase. I can still use it with the Seidio case but the connection feels flimsy, since Richardsolo includes a clip to secure the connection to the phone.
 
I'm quite fond of the Richardsolo personally.
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