Eibach's are pretty stiff, about twice as stiff as the regular boxster swaybars:
Drilling an extra hole in a sway bar end to give a softer setting
The front is comparable to the gt3 front bar in full stiff, and all 3 holes on the rear bar are stiffer than the tarret bar in the stiffest position. In addition, running the softest hole on the eibach with aftermarket drop links may cause contact between the axle and the drop link. I carved a little chunk out of my aluminum drop link bodies. But I may also have had something else wrong as well.
I think that set would help with the stock suspension but might be more than necessary if using the Ohlin's.
I'm running the Ohlin's on my Cayman with tarret bars and it is fantastic, and I also ran the tarret bars on my 986 with sport suspension with Koni FSD/special active and it was really good.
Can't go wrong with the Ohlin's, and if you set the car up with them, and later go with adjustable bars, it shouldn't affect your alignment or corner balance.