Over the years I've ran Standard springs, Eibach Prolines, Eibach sportlines and my current car runs Grams - All with 172 cup/182 cup shocks depending on the car
I found the Standard springs and eibach prolines almost identical, in fact I couldn't tell a difference - granted I didn't jump back and forward to test with 2 cars.
I REALLY like cup dampers and Sportlines - They are a brilliant match, subtle drop, car is much nicer on turn in, ride comfort is good, barely any harsher than stock and high speed stability feels much improved.
I took advantage of the grams springs and cup shocks deal that was going at the time I built my van, now unfortunately I run all polly bushes on this one which none of my others ran so it wouldn't be fair for me to compare the springs to sportlines. The van has a harshness to its ride that I didn't have on my cars before but this will almost certainly be down to the bushes, however it feels more planted and the back end is more playful which I would say is mostly down to the springs.
while I couldn't pick a favourite between the Grams and Sportlines due to the above, I am happy to say what ever ones you choose I think you will find them well matched to the cup dampers.