Prada*-* Suede Driver*-* Neiman Marcus
They are even more amazing IRL; the picture does NOT do them justice. I wore them last night with black slacks and a sparkly sweater and it was perfect for a not-too-dressy party...so comfy so I could stand and chit chat all evening!
I understand your reservations about the Tory Burch. I already have a plain black pair, so I like the gold. The leather is also unbelievably soft on the TB, but the elastic backing makes it a bit difficult to size. Definitely get your normal size, if not one size smaller. I think they also have some styles with a leather medallion which is a little more understated.
I also have a pair of Delmans that are quite nice. I would look at them as well. There is a plain pair at Bergdorf Goodman if you are in Manhattan.
I also have a pair of Jeffrey Campbell love flats, but didn't mention them because you specifically asked for a designer pair.
I would also check out Marc by Marc Jacobs, although I can't think of any styles off the top of my head.
Just so you know, all of the new navy reva ballet flats come with a silver medallion. It is impossible to find the one with the gold medallion. If you strike out with Tory Burch, call plaza too. I ordered mine there and they were quite nice. They are probably out of stock online.