I think giving GRE again would be the best option, the Verbal scores presents your knowledge of comprehension, reasoning, words, and lots of other areas.
If you can get a Verbal score of over 550 then you can boost your chances of admit and aid, if you are working and cannot devotee time then go for some free online virtual classes on GRE which you can attend on Sundays and Saturdays. Many of such sites exists like: Wiziq, examville, blueteach, classroom20, etc but there is one which is targeting GRE mid 2011 http://onlineclasses.nanotechbiz.org/.
Improving your score will give you en edge for the admission as well as getting RA, nonetheless you will get idea about english which will also help you in your future exam prep.
Best wishes,