T1- Punisher or Rifter. Punisher has an OMG tank with the ship bonuses, and the Rifter is a very fast and versatile frigate with a surprising punch.
Faction - Amarr Navy Slicer or Succubus. The other faction ships have split weapons systems and can't really pump out the DPS. The Slicer can be fitted to have a decent tank or can be speed fitted effectively, and can hammer out 125+ DPS without much thought. The Succubus is a monster: Mine can pump out 200+ DPS, runs about 1k m/s with a faction AB, and has a 2200 hp shield buffer (almost 7000 EHP total) Neither ship is cheap, though.
T2 - Ishkur is king in my book. 5 small drones and blasters give it around 200 DPS, and it's T2 resists coupled with a small cap injector and an SAR give it a lot of longevity in a fight. I've even killed Neut Arbis with mine, waiting until they run their cap down and then running the booster for some surprise buttsechs.