Lenders take all three CRA scores (FICOs) and tosses out the highest and lowest -- using your middle score.
WHAT that score will be, who knows?? Only because they seem to use a mortgage enhanced FICO score. So, it SEEMS that you could have, say, a 750 FICO midscore, but if you had a foreclosure 5 years ago, your mortgage enhanced FICO will lower that a bit, giving you perhaps, a 700.
Grab your FICOs here at MyFico and see where you stand. Then, since you seem to have oodles of questions (or at least, you more than likely WILL), come back here and give some info on your situation ($XX,XXX income, XX% DtI, $XX,XXX Down Payment, etc) and one of the awesome mortgage Gurus will chime in and tell you what you might need to do to close the loan and buy a home!!
Best of luck!!