............... I would get Gens Ace or Skylipo from Hobbypartz.
+1 on that.
Gens Ace have a 5c charge rate and I have fast charged them at the field at the 5c rate and they never even warmed a bit and would charge in about 15 mins.
Skylipos are also good but only have a field charge rate of 2c.
I also have some Nano-Tech batteries from HK wich also has a 5c charge rate. I regularly field charged them at a 3c rate (highest amps my charger will go) without any issues.
Hobbypartz has fast reliable shipping and you should receive your batteries within a week.
I do feel that buying more batteries at a cheaper price gets you more flying time compared to expensive batteries. If they don't last as long who cares - they were cheap and you did do more flying everytime you went to the field. JMO