Also when I was in store last week they said they only show up online for collection if they have more than 5 of that model.
If you have the budget to change to SS I would do it. A case will just make it bulky surely? I got a gold aluminium on launch and really did not like the colour or feel so swapped for a SS as soon as one came into stock at local store. I had an online order as back up but picked one up before that though I had to buy the Milanese strap version over a sports strap. It was my first AW and I always thought I would never pay for the SS version but honestly so much nicer to look at and wear and besides I see this as something I will keep for at least 2 years before upgrading.