I'd keep your stock springs and go with Koni Special Active shocks, especially since you're happy with your ride height. Definitely do a refresh of the mounting components; front strut mounts, rear upper and lower shock mounts, bump stops, and shock boots.
The BMW Performance springs are great, but I think they're NLA now, so sourcing them will be exceedingly difficult.
If you do a spring/shock combo, I liked my Koni Sport shocks with Eibach Pro Kit springs.
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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