People usually do the CP option with very high numbers. If you want to go for AOS, if you look at the last year's visa bulletins, all numbers became current in sep 2009, but this was mentioned in the Aug 2009 bulletin. So if that be the case, you could apply by 1st of Aug 2010 (if the bulletin in Aug 2010 shows all numbers current in Sep). Just make sure all your paperwork is complete and you are not missing anything that could be asked for at the interview.
Thanks CoolDude for your answer.
You have a point, since last year's my number became current in August, I am wondering if doing AOS is the smartest way since it leaves USCIS about 60 days to process my case...
Now, I am just thinking about switching to CP and maybe my chances to get a second letter might be higher?
Also, something that KCC seems to refuse to answer is when they send this second letter via CP? Do they also refer to the Visa Bulletin or is it just in order it was received?
If you have any input on that, I'd like to know!!!
Thanks again