Tax Status (Resident Alien/NR Alien)?

I was on OPT (optional practical training) i.e. Student (F-1) visa till August 4 2002 and then on H1-B visa for the rest of the year.

Should I file my taxes as Resident alien (1040/1040EZ) or as Non-resident Alien (1040NR/1040NR-EZ)?

What I understand is that if you are less than 183 days on H1-B and rest of the year you are on F-1 visa, you can consider yourself as non-resident for tax purposes. Am I right?

I would really appreciate some advise in this matter. Thanks!

call IRS and ask them that would be better, they are very helpful