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I've used iRealSMS and mySMS and honestly, I prefer the default one. The others seem too slow. If you like them, though, try iRealSMS. It has some nice features like single message view, landscape and quick reply.
 
BiteSMS is the only one near the default one...

That being said, id just rather use the default since i hardly ever have to forward messages or use landscape.
 
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