I recently had a turbo fitted by an Alfa dealer. turned out it was a recon unit...........not sure if it's just their policy or Alfa UK, but was told that is normal practice. Cost was £676 + vat for the supercharger!! itself. BTW make sure you find out why the turbo failed. The dealer fitted 3 turbos before getting the job right, initially blaming non-dealer service (oil used was incorrect - no way to disprove of course). The first two lasted a max of 150 miles. They replaced the oil feed pipe, and the third turbo has ran okay since. Apparently it's possible to check the oil flow (in and out) when replacing the turbo. Someone more mechanically minded on here may help with that - obviously not done on mine. FYI I'm 99% sure that the turbo's for the 1.9 and 2.4 are identical Garrett units, so may be woth trying a GM dealer for price as they're used in Vectras, oh and SAABs.
As the main dealer only offers a 12month warranty County Recons may be worth a punt to save money, but if you have similar issues to me you'll end up in a legal wrangle with differnt parties supplying and fitting, as I'm sure they'll blame each other, and I could have ended up paying the labour cost x 3, or worse still turbo's x 3!!
The function of man is to live, not to exist. I shall not waste my days trying to prolong them. I shall use my time.