I just upgraded to the s5 SS SB from a s3 SS SB. Amazon had the cellular model for $50 off ($724 total). It is still syncing the backup but, I like going from the S3 42mm to the 44mm size. I debated a good while between 40 or 44mm. I can tell already, that I made the right decision. It is also noticeably faster installing the 6.1 update and transferring the backup.
@BasicGreatGuy
What band are you using?