Based on discussions on the R-M222 list ScotlandDNA Chromo2 is one of three tests they find useful. The other two are Full Genomes (if you want to be at the forefront) or FTDNA Big Y.

What really helps is an active group based on either surname or SNP. If you release your data to an active project they will slice it and dice it for you.

You might want to wander around this site for a bit.

http://www.anthrogenica.com/forum.php

I have been following the R-M222 discussion for some time now. This is the line named for Niall of the Nine hostages although it now it appears the mutation happened long before Niall came along. A McElmurry cousin tested positive for R-M222 which confirms my McElmurrys are not closely related to the Morrisons of Lewis and Harris.