The Dynavector 20, of course. The 17d needs proper matching and expert setup.
Those Grados need to go. Those are for beginners. Oops, there I go again.
Ok, not to be an ass, if you're thinking something like a Grado, go for the Cartridge Man. Far far better than a Grado. I think there's also a Nagaoka in that range. Very nice also.
I've tried the Dynavector 17d2mk2, many times in several different arms. I prefer both versions of the 20x. While the 17d is very airy, detailed and ethereal up top, it always sounds thin and lightweight to me. Its detailed sound impresses initially, but I tire of it rather quickly. Plenty of air and space, but not enough meat on the bone. I much prefer the denser and more slammin, weighty and colorful presentation of the 20x. Of course, these are my preferences, and others will prefer the 17d. It would probably work well in a rig that is balanced towards thick, dark and slow or appeal to those that favor its attributes and priorities. Also, the 17d's tiny cantilever of 1.7mm is a bitch to see and setup!
I heartily second the recommendation for the Cartridge Man Music Maker mk3 cartridge. Not well known here in the states, but man, what a cartridge! Strapped onto my Hadcock 242 arm (combined with the Cartridge Man Isolator) it is one seriously good music making machine! The presentation is deep, detailed, palpable, toney, and oh-so-natural, and most important of all, hugely immersive and musical. Probably the best arm / cartridge combo I've personally experienced in my own rig. And I've tried more than a few. (Table is Eurolab (Scheu) Premier mk2)
Of course, I have no idea how the MM3 would gel on your WT arm. It looks similar to the Hadcock in that both are unipivot, and spindly kindof lightweight (apparently?) metallic affairs, and both depart from traditional arm design approaches. But beyond that, I know zilch about the WT arm. I do know the MM3 prefers light to medium arms, no more than 13g effective mass. And it has a very narrow VTF range in which it really sings, around 1.58 g, give or take .05g. Its healthy output allows it to be used without the added expense and complication of a SUT. And to my ear, it sounds as open and airy as any MC I've ever heard. I will say upfront, my personal playground has mostly been HO MM and MC, but I have heard LO MC in other rigs.
Google to find all the positive comments, mostly pro reviews.