I have to agree with many of the posters as Thief sounds like it hits on most of your requirements. Though you might have trouble with the "pretty armor" part. As much of the leather armor looks very similar IMO - variations of trench coats. There ARE about 3 or 4 sets of the leather armor that are pretty cool though, but you'd probably want to wait until higher levels to use the skins for those, as some of the skins aren't cheap.
Here are the leather armor sets for GW2. The first one on the list is the one I'm currently using and I love it! As you can see, most of the sets are basically variations of "trench coats" which drove me mad leveling as I got so sick of looking at the coats - until I discovered that some of the nicer looking skins aren't too terribly expensive. I think the most expensive is also the most "reveling" set, the Human Tier 3 - that one is about 119 gold if you want the ENTIRE set ...which I have no idea how anyone could possibly have that much money! heheh I might end up getting the Order of Whispers set eventually.