i tend to avoid src in nebula, when i can. but most of the time i just try the library i have in mind and do not think too much about src. when i get the sound i am after with a converted library, why not just take it??
system 1: windows 8 32 bit - samplitude prox/x3, tracktion6/7, reaper system 2: mac osx yosemite - reaper(32+64bit), tracktion6/7(32+64bit)
both systems on: macbook pro (late 2009), core 2 duo 3,06 ghz, 4 gb ram, graphic: nvidia geforce 9600M GT 512 MB