This link is for the BARTLETT-DNA Project.We have 8 Participants who have done mtDNA, but of course their mtDNA tracks their famale line, not the BARTLETT line.
Any test will do to get your DNA in storage (for any future DNA testing that comes along). From my initial Y-DNA test of 25 markers, I've since upgraded to 37 markers, then 67-markers; then the mtDNA HVR1&2 test; recently the mtDNA Full Genome Sequence; and more recently another test to find out where my Y-DNA is more precisely.They've done all these test from the 2 small vials I sent them in Oct 2002. If you can afford it, I'd recommend the HVR1&2 test which tests more of the mtDNA, and any matches would be more meaningful (ie be more likely to have a common ancestor with you).
A warning, however: mtDNA testing is a difficult row to hoe. There are no SURNAME projects to join, and no coordinator to help you track down matches.If you have a common mtDNA, you'll get more matches, but the common ancestor may be 500 years ago - too ancient to do any good.If you have an uncommon mtDNA, then there will be fewer matches, but they may be more promising.
Another tack (instead of just waiting for a match) is to try to find a likely candidate ancestors, then use your genealogical skills to track down the female line descendants until you get a living person to also test for mtDNA. The living person may be a male or female - because the mothers pass the mtDNA to both sons and daughters, but only the daughters can pass it on to their children.So I have my Mom's DNA (which is a good thing because she died in 1961 - so I now have it preserved for the next 25 years - waiting for better tests to be developed; probably ones that use all of the chromosomes not just the mtDNA).
Most folks post their results on the free mitosearch database, which will also tell you if someone else has a close match.Actually, Family Tree DNA will send you an eamil if your mtDNA match anyone else in their files and they send you more emails as more folks get tested and match you. They have the largest database of results.But folks who test with other companies can also post at mitosearch, so you have an even wider range of possibilities.Still, it's hard to find an mtDNA match, probably because not as many folks have done mtDNA yet.But when someone who descends from any of your all-female line grandmothers does get tested, you'll be notified of a match.
It's actually a simple concept: a match means a common ancestor; and mis-match means there isn't a common ancestor (within thousands of years anyway).
In any case you'll learn your DNA Haplogroup (google it), and from which of the "Seven Daughters of Eve" (book in paperback by Dr Bryan Sykes) you descend, probably 10,000 years ago or so.
The hardest part is the 6 week wait after you send in your samples.