News for G1a1 persons.
Before getting to your specific G1 subgroup, G1 in general today seems most common in Iran and the countries bordering it to the west. But G1 has spread out as far east as India, Siberia and China and west to western Europe. Late last year we learned from a study that there is pocket of G1 persons also in Armenia, similar to the G1 pocket of men found earlier in Kazakhstan. We only have limited information about these Armenian samples, but the Kazakh men have been in the G project and well tested. New studies also showed that G1 is otherwise rare in the Caucasus Mountains area north of Armenia. It is unknown if the new Armenian samples might fall within G1a or not. Your G1a1 subgroup so far seems overwhelming Ashkenazi Jewish with n.e. Europe so far listed as the only area of ancestral origins. This differs from most Jewish G groups which seem to have representatives from countries such as Germany, the Czech Republic, Hungary and Romania.
Your sample in the G project has provided valuable information. It is only by seeing as many samples as possible that new subgroups can be identified.
There are two types of general G1a persons
(1) Those only predicted G1a1. You have marker values very similar to persons who are confirmed G1a.
(2) Those few confirmed G1a but not tested for all the subgroups
While G1a1 persons have similar marker values and we are comfortable that those listed as predicted as G1a1 are G1a1, there is a possibility that that not everyone has all three of the SNP mutations that define G1a1 (namely L201, L202 and L203)
Any additional testing for all three would be a welcome addition to our knowledge base.  If someone has varying results for the three, that would be the basis of a new subgroup and a split in the G1a1 subrgoup.
A special word to the Epstein, Goldman and Mason families.  G1a1 is much older than the common ancestor of your families.  Only one person with these families needs to have the L201, L201 and L203 testing.
As mentioned in the general news section, if you are willing to better define your grouping, I will be glad to give individual recommendations and help. rayhbanks@cox.net.