FAMILY-SPONSORED PREFERENCES

First:  Unmarried Sons and Daughters of Citizens:  23,400 plus any numbers not required for fourth preference.

Second:  Spouses and Children, and Unmarried Sons and Daughters of Permanent Residents:  114,200, plus the number (if any) by which the worldwide family preference level exceeds 226,000, and any unused first preference numbers:

A.  Spouses and Children:  77% of the overall second preference limitation, of which 75% are exempt from the per-country limit;

B.  Unmarried Sons and Daughters (21 years of age or older):  23% of the overall second preference limitation.

Third:  Married Sons and Daughters of Citizens:  23,400, plus any numbers not required by first and second preferences.

Fourth:  Brothers and Sisters of Adult Citizens:  65,000, plus any numbers not required by first three preferences.

As of dec 2010, the priority date for catergory 2A, the spouses and children of a green card holder, is 1 Aug 2010 which is 4 months back. If you process now, you can start applying for visa in about 4 months, cool.