EBC Greens are supposed to be as dust free as possible, trouble is I really don't think they suit cars as heavy as ours- in fact I haven't really got on with any of their range over the years, although I clearly do enjoy late braking and like a fairly untielding setup which others would probably hate. For less aggressive road driving they should be acceptible, but my gut feeling is that they may be a small step behind factory pads in terms of overall ability (however I've not done this direct comparison, so others may disagree).
The Porterfields I use are a little dead for the very first slow stop in the morning, but they've never caused me any problems as they come up to temperature very quickly. I buy these fom EBS racing in the States as they're really over priced in the UK (from memory it's $99 v £150+). However this is a rather extreme pad and if you're concerned about dust then I'd definately stay away from them.
I've not tried Mintex but have heard lots of good things about them, trouble is I've wasted a lot of money on pads that I didn't like and had to bin them, so am loath to move away from what I'm currently finding works. I think you can get Mintex from Demon Tweaks, but there are bound to be other places that are cheaper.
If I was in your shoes I might just contemplate making sure I had really good fluid like Castrol SRF or Response and sticking with something closer to standard pads, this would present less of a gamble and help keep the dust manageable.
Best regards,
Peter