The Terminator wiki should have info on all the Terminator types used in the movie and then some:
http://terminator.wikia.com/wiki/Terminator_Wiki
My favorite of the new batch of Terminators was in the video game but not in the film unfortunately:
http://terminator.wikia.com/wiki/Series_7T
That Tetrapod would've been much sweeter to watch in action than the T-600s.
As for T4, I thought the look and feel of the film were great, but the characterization left a lot to be desired. John Connor was too remote, and made some pretty reckless and stupid decisions. He just wasn't someone I liked or routed for, despite the fact that Bale's involvement really got me into the theater. I was disappointed with his performance. Also, Kate was a cipher and the rest of his crew didn't get much in the way of development. Perhaps Moon Bloodgood's character Blair got the most. Common was horrible as Barnes.
The storyline with Marcus and Kyle was much better and I wish this had been more about what the movie was supposed to be about. I think the shift from Marcus to John Connor as the main character and TPTB punking out on the original ending for the film, without going back and really revising the story all the way through to reflect that fundamental change, really hurt the film. I'm not trying to spoil too much for those who haven't watched the film but Skynet does somethings in the movie that left me scratching my head. There are two cool cameos though and a few nods to the previous movies that are nice.
Overall, a decent attempt at the future war, but it could've been much better. I've heard some of McG's plans for a T5, and if it does get made, its going to be even worse than T4, which overall, wasn't that bad.