not just cause i have one, but id have to say ive heard alot better things of the nsb90's.... and yea mix if ya wish i got mine set up with an exide orbital for the time being.....
nsb90 and a d3100 are said to be very similar. if it was a daily build i would lean more to kinetik. as far as burping goes... i have seen people use all three batteries successfully.
iirc powermaster batteries are rated to do thier rated power for at least 5 seconds. where as these other brands dont give a rating like that and might not to thier rated power past a few seconds....
not saying kinetiks are over rated or worthless, but there's a reason d3100's a lil more expensive. Because you get what you pay for and they are best IMO on the market. I've played with a variety of other batteries and so far the d3100 stomps everythign else.