I've ended up with a Pitaka case for my 15PM. I also have a Torras MagSafe thin shell which is nice enough, but feels a little cheap (because it is). I had a FineWoven case which I initially quite liked (and posted positive things about earlier in this thread!), but once I actually fitted it to the phone it added too much bulk, which given the durability concerns made it hard to justify (I'll take bulk if it means lasting protection!).
In the end I took the FineWoven back to Apple and spent the money on a Pitaka. It's not going to offer much in terms of drop protection, but it looks and feels great, and the MagSafe performance is excellent.