As others have indicated, chanting in English is fine. If you want to do chanting in English or Pali/English combinations you might listen to some of the chants at Abhayagiri http://www.abhayagiri.org/index.php/mai ... wnload/C20
which are rendered in sort of English Church Chanting style.
However, I see some advantages in practising chants in Pali (while following English translation):
1. You learn some of the Pali terms and how to pronounce them.
2. You can chant with non-English speakers. Doesn't matter if they are Thai or Chinese or whatever.
3. Sometimes the available English translations sound a little silly, which can be distracting.
4. Some chants sound incredibly inspiring in Pali because they have been composed to make use of the rhythm of the particular words.