James, I would be very hesitant to use aftermarket shocks, even Bilstein or Koni as it will noticeably change what is a superbly smooth suspension.
If you do replace with OEM, make sure they are to genuine quality... and suit EAS. Don't buy Britpart or Allmakes/Bearmach.
Talk to either Bilstein or Koni head office if you want to go aftermarket, and make sure what they are selling you suits air springs, as the factory dampers are not charged, they are an old school hydraulic shock (do not expand on their own).
I'd be looking to Koni as they make shocks like this...



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