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The BMWP springs will give the least drop of aftermarket springs, but, they are more expensive than others at around $400 for the set. The positive is they are matched to the car's weight. They aren't a huge increase in spring rate from stock.
Nothing at all wrong with keeping your Sport springs with better dampers. If you like Bilsteins you'll get into the B6 vs B8 conundrum. Koni's don't present that issue. You'll get a significantly better ride in terms of comfort and handling with new dampers regardless of which ones you go for.
Certainly heed asbrr's advice and replace everything else.
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E82 / BMWP Springs / Koni Yellows / M front control arms / Adjustable front endlinks / M rear guide rods / Whiteline Poly RSFB
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