With haplogroup H people often have literally thousands of matches with the HVR1 test. I have some people with over 8000 matches. Because of the preponderance of matches people who have upgraded to the higher-resolution tests will usually switch off the notifications for the HVR1 matches so that they don't get inundated with match e-mails.
The combined HVR1 + HVR2 test gives you results for about 1143 base pairs in the hypervariable region, otherwise known as the control region. Mutations are more likely to occur in this region. The full sequence test will give you results for all 16,569 base pairs in the mitochondrial genome. A lot of the mutations that define the different subclades are only found in the coding region. You only get the coding region results from the FGS test.
If you really want to know your subclade then the FGS is the way to go. It is however still comparatively quite expensive. FTDNA usually have an upgrade sale about once a year so it might be an idea to wait for the next one. There are about 14,000 people in the FTDNA database who have taken the FGS test (including me!) so the chances of finding a genealogically significant match are quite low. An exact FGS match is usually within a genealogical timeframe, whereas with the lower resolution tests 50% of the time a match could indicate a shared ancestor in a much deeper timeframe.
However because the test is still quite new you are effectively participating in the research. The results of FTDNA customers are helping to define the branches of the mitochondrial tree. Customers can upload their results to GenBank, a public database used by scientific researchers.
Whatever you decide make sure you join the haplogroup H project:
http://www.familytreedna.com/public/H%20mtDNA%20HaplogroupThere are subprojects for the various clades but you can only join those if you have FGS results.
