It really depends on how exactly you are using your sd card. I know in the OP you said you have a lot of music. Do you typically clear all of your music and transfer all new stuff to the phone?
I have been using a sandisk class 6 for quite some time now and I absolutely love it. It is perfect for my needs. But I do not do a lot of heavy music on my sd card. I have read that even the class 10 Lexar sd cards have terrible random speeds, so I would definitely avoid them at all costs.
if I order from amazon, should I be wary of the brand name? like, have some of you bought via amazon what appeared to be a kingston or whatever known brand, only to find it probably is not?
I read the advice about watching the source carefully....
if I order from amazon, should I be wary of the brand name?
As long as it is from amazon and not a store. But again amazon is better about policing its stores than ebay is. I have bought from amazon many times and not once had a problem with getting a different product then what I ordered.
XDA Developers was founded by developers, for developers. It is now a valuable resource for people who want to make the most of their mobile devices, from customizing the look and feel to adding new functionality. Are you a developer?