There are 2 Terminator trilogies that take place right after T2 leaves off you could try. The subplot of one is The John Connor Chronicles (No relation to the later series). This one is a little invovled, telling the story of three different timelines, but everything is clearly labeled so you should have no trouble following it. I read it in Febuary 2006 and loved it.
The second is three different titles:
These also tell the story from the point where T2 leaves off, but I haven't read them yet, so that's all I know about them.
There are also two novels that continue the story from where T3 leaves off. I read both of these, and found them passable. Don't remember the titles anymore, but one of them have to do with dreams. Google Terminator Books, and you should be able to find them.
I hope this helps.