We went out for the WSBK in March and stayed at the Holiday Inn Express. Clean, cheap and about a 20min walk or cheap cab into town. We used the train to the circuit and bought tickets at the track. We sat in the blue and green sections where you can see the 1st and 2nd corners pretty well. Be warned though, the beer inside the circuit is alcohol free!!
Drop me a mail if you want more info - I might still have a map kicking about.
Cheers,
Paul