Sport suspension / sport springs Audi C4 S4 4.2

Good morning,Christmas is over to screw into the garage.Who can help me here,What's better?Orginal sports shock absorbers maintain only new springs 55/35 K.A.W or H&R 40/40 at S6 rims 8X18.Or rather the coilover suspension from Bilstein? Who has already had experience with one or the other option, and can give me tips.Hardness of the original sports suspension is sufficient in my opinion.Would like to bring my Audi a little closer to the ground due to the 18 customs-sleeps, so no extreme lowering.And would like to take Grandma with you, without that on the way constantly the bite falls out of her mouth.