I can only speak for the ASTs, the ride is fantastic from smooth to harsh depending on how you want it dialed in.
But I'd be lying if I didn't say how annoying it was to get them. A few of us on here were promised 4-6week turn around. Lets just say it took at 4 months instead.
TC Kline are also a popular choice besides the KW. I think those are your only 3 options.