The answers listed below give good advise.
I have a couple of additional suggestions:
Try to narrow down where in Napa you would like to live. I assume schools will be important.
In addition, consider where you are going to work so that you can anticipate the commute.
Check out the local paper (Napa Register) on line so that you get an idea of what may be available.
The amount of $2,500 more or less should be enough to find a comfortable place.
I would get very serious about the first of October.
If you need assistance, I would be happy to have someone help you.
Wine Country Group