The best riding springs will be the ones that don't have extra preload. If your main concern is ride quality, take any additional lift from preloaded coils and put it out of your mind (top plate spacers may be the alternative to that rule, more on that below).
Having had a few different combos of shocks & springs, this is what I would go with given the goal of best on road ride:
For the front: I would go with Tundra 5100's on the bottom setting. I believe on the bottom perch they would ride smoother than a set of Bilstein HD's or Tokiko Trekmasters. The bottom perch on the Tundra 5100's provides no lift, and the Tacoma 5100's bottom perch gives .85" IIRC, so in trying to avoid extra preload to coils, the Tundra ones would be my pick. I would either pair those with a 99 tall or the Tacoma TRD springs. In my mind, this would be one of the cushiest setups. Add a 1"-2" top plate spacer and you'd get your lift and still probably keep the ride quality (yeah, I know top plate spacers have their stigma, but we're talking ride quality here, right?

). One thought that I would like to see someone try is some aftermarket c/o's like Icon or King etc and use lighter spring rate; say 500lb or 550 and run as little preload as possible. You could even valve them softer if you had an idea of what could potentially soften up the small bump compliance, but this could be an expensive and time consuming venture!