The original Alfa five-hole horseshoe rims looked small to me. I put Nokian WRD3 winter tyres on the old rims and Goodyear Eagle F1 Asymmetric tyres on the new 18" rims. (Update: I no longer have the original Alfa rims, as they were stolen from my garage complete with the new winter tyres. Bastards.)
2008 Alfa Romeo Brera

I thought long and hard about which 18" alloys I should buy to replace the original 17" rims.

These Wolfrace were the ones I chose in the end. I thought they were a modern update on the original five-hole horseshoe design. I am getting a load of grief from the Alfa purists on AlfaOwners.com

Well, you pays your money and you takes your choice...