Well I have a bunch of U-Turn options for ya. I chose three favorite Pokemon from Gen 5, so sue me ;P
Mienshao @ Expert Belt
EVs: 252 Spd / 252 Atk / 4 SDef
- High Jump Kick
- Fake Out/Hidden Power [Ice]
- Stone Edge
With high speed, Regenerator, high attack, and an Expert Belt. Well, need I say more?
Ok fine I will say more.
Regenerator and Expert Belt allow fro some great scouting. HJK is incredible STAB and missing isn't as bad due to Regenerator. Stone Edge, while it does have somewhat crappy accuracy, still provides great coverage. You can either run Fake Out for some first turn priority, or you can run HP Ice for some more coverage against Defensive walls like Gliscor.
Zoroark @ Choice Scarf
EVs: 252 Spd / 252 SAtk / 4 Atk
- Focus Blast
- Dark Pulse
With Scarf and Illusion you can have a great Scarfer. It can screw around with other people's minds and really mess over counters. Good coverage moves are for good coverage.
Genesect @ Choice Scarf
EVs: 252 Spd / 252 Atk / 4 SAtk
- Ice Beam
- Iron Head
Lastly, a favorite of mine, Genesect. It makes a great Scarfer with Download and with a STAB U-Turn with a potential attack boost, well hello dear, would you like some hammer to the face?! Ice Beam is coverage, Iron Head is STAB and good against the new fairy typing, while Explosion is just what I normally run, and deals a nasty surprise to those nubs who think they're about to kill Genesect.