What common charger should I buy for my iPhone and android?

I use an iPhone 4S and a Nexus 4 and charge them with their separate chargers. The LG charger the nexus 4 came with can charge both, but it's rather slow, so I'm on the lookout for a fast 2amp charger which can charge both the nexus and the iphone quickly. I have been reading some good reviews about the Sony CP-AD2, it's 2.1 amp, but i don't know if it may reject the iphone like some samsung travel chargers do. Bottomline is, I want a good fast charger for both of my phones, without burning a hole in my pocket. ( **cough**apple oem chargers**cough**) Any suggestions?

Don't buy a common charger for both devices. The reason is because Apple sends a small charge down the data lines of the cable. They do this so when somebody gets a non-Apple charger the phone will charge slowly. It's just a money-grabbing tactic by Apple.
Also, different Android phones need different levels of electricity. My LG G Pro needs 5 volts at 1.8 amps to charge it's fastest. The galaxy s4 needs 5 volts at 2.0 amps to charge at it's fastest. IPhone chargers only put out, I think it's either 12, 4, or 5 volts, at 1.0 amps. So if you grab a regular charger that is 5 volts at 1.0 amps, it will be slow for everybody.
--If you use a regular charger for both devices, the iPhone will charge ridiculously slowly.
--If you use an iPhone charger for both devices, the Android will charge ridiculously slowly.

This would work if Apple didn't screw it up with their proprietary connectors, though. You could easily take a 5 or 12 volt charger at 2.0 amps and charge every phone at it's maximum charging speed, but not iPhones. Trust me, i've done it before. I've taken a 2 amp charger and plugged it into old 2010 android phones, and they charged as quickly as their stock chargers did.

Don't buy a common charger