Tubus are expedition-grade and may be overkill but they work with just about any standard bike and pannier. Your Kona has standard rack fittings.
Ortleib is similar Tutonic expedition-grade kit and good stuff.
Good quality panniers have solid internal stiffeneing so don't need the dog-leg strut. Lower grade panniers can wobble around when heavily loaded and strike the wheel, hence the need for a dogleg strut.

Rixen and kaul do a quick-release rack-top fitting for any standard rack for a wide variety of rack-top luggage.
Topeak MTX have a proprietry racktop fitting but I think it gets in the way of the general purpose use of the rack.