Justified is probably the best done modernized western(if you could call it that) that I've seen. This show is just amazing. Timothy Oliphant and his hat are a great lead and the rest of the cast are quite powerful actors as well.
The show mixes crime procedural with cowboy action and powerful social situations to create a drama that draws you in until the very end.
If you like all around badassery and lots of gun play you'll love this show, or if you're a dude with half a brain. Also, if you enjoyed the shield or the unit, both of which were amazing shows you should check out Shawn Ryan's new show The Chicago Code, previews look great and i'll have to watch it on the dvr when i get a chance this weekend.