I am looking for a new rear Derailleur for my 8 Speed Bianchi. I am replacing a Mirage dr. I have only been able to find two for sale. either a New old stock Record Ti 8 speed or a used Veloce. The price difference is pretty significant like 5x as much. Is it worth upgrading to the Record dr or will the Veloce work fine? My front Dr is Veloce.