You pays your money and takes your choice. Eurocarparts supply OEM rears for £75 each and fronts for £97 (plus fitting of course - unless you DIY). I would replace all four at your mileage.
KONI FSDs are well respected on this forum, as are KONI Sports (yellows). Do a search - this topic has been debated long and hard on many occasions.
E92 pre-LCI 325i - Ohlins R&T; H&R spacers; M3 strut brace; Meyle HD droplinks; BMS clutch stop; BMS CDV; RE g/box mounts; Saikoumichi OCC; K&N; Cyba scoops; BMW Perf Exhaust; M3 rear spoiler; LED Angels; BMW Perf black grille; CSL reps; SSDD carbon diffuser; Monster Wrap black roof