greenstuffs really are the absolute worst brake pad i have ever used in my entire life.
i've used the following:
ebc greenstuff
ebc redstuff
ebc yellowstuff
hawk hps
hawk hp+
hawk blue 9012
akebono street performance
of those, i would recommend the redstuff, yellowstuff, and hp+ for a higher power street saab.
the greenstuff was complete shit. greenstuff pads + ebc rotors, and i couldnt even lock up my front tires from 30mph on my ng900 with good tires. they are fucking terrible.
ebc redstuff, and yellowstuff i found to be pretty similar in street driving. my redstuff pads are VERY loud when it is below freezing, until they've gotten some heat into them. i imagine the yellowstuff is worse. not a problem, just something to keep in mind. i've yet to experience fade with either the yellowstuff or redstuff pads (including a full track day at BIR with redstuff pads and a near empty track). i currently have red stuff pads in my white ng900, front and back.
the HPS pads were not as bad as the greenstuff pads, but i'd skip them.
i found the hp+ pads to be similar to the redstuff pads, but with a little more dust. i currently have these in my dark NG900 with the brembo BBK up front, in both front and back.
the blues are an awesome track pad, but they arent great if they are not warmed up. will be purchasing a set of these as a track only pad, but wouldnt run them on the street.
the akebono street ceramic pads were low dust, quiet, and had good initial bite. they were in my spg, and while i never did any track days or sustained spirited driving with them, i suspect they would not hold up well.
if you have any sort of power modifications at all, upgraded brakes are a must in my opinion.
i'd go with ebc redstuff, yellowstuff, or hawk hp+ pads.