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I bought a 5.4V UBEC from RBORT here on RR. Running it with a TP 910 mAh 3S and it works GREAT. Extremely consistent voltage under load and the unit itself hardly gets warm. The entire battery setup is compact and only weighs around 3oz and I can easily get 4 HARD 3D flights with power to spare. A TP 1320 mAh 3S would probably give you 6-7 flights with minimal weight gain. IMHO, I think it's better than any Duralite or Fromeco setup.
Another option you may want to consider is the new Castle Creations BEC. It's supposed to be able to handle up to 10 amps and has an adjustable voltage from 4.8-6V, and it is EXTREMELY small.