What is the most reliable/accurate service for DNA analysis for genealogy/ancestry purposes?

reply have given similar previous question,
think answers query.

human cells contain 23 pairs of chromosomes: 22 pairs of autosomes, , 1 pair of sex chromosomes. females carry pair of x chromosomes can swap, or recombine, similar regions of dna during meiosis. however, males harbor 1 x chromosome , 1 y chromosome, , significant recombination between these dissimilar sex chromosomes not occur. therefore, non-recombining region of y chromosome (nry) remains largely unchanged on many generations, directly passed father son, son grandson, , on, along genetic variations in nry may present. scientists can use genetic variations, such single nucleotide polymorphisms (snps), on y chromosome markers of human ancestry , migration.
effective , best companies retest until conclusive result.
if have, say, first 12 markers tested($149 ftdna), give indication of originated, more markers test on, more information gained, if test on maximumum of, 67 markers ($349 ftdna), possible find match else carrying own, or different surname, , prove link perhaps no "paper trail" exists. can therefore pinpoint place in ancestors lived in recent history dna not, obviously,
have surname attached it, surnames have been used around 700 years , of course dna originated 10s of thousands of years ago. can have snp test show migratory pattern of ancient ancestors, having said that, can join surname project (e.g. ftdna) , receive discounted prices on tests.
recommend make aware of various tests available, , costs each testing company.
plus, check out available after have tested.
used family tree dna ,they first in field (founded in 1999), have largest data base, , testing national geographic's genome project, "after sales" excellent , consider best, have make own decision on that.
http://www.familytreedna.org
note :-
if female, carry mother's mtdna, , mother's mtdna, , mother's mtdna etc.,etc.,etc. , show mother's lineage (you pass mtdna on daughters , sons, sons not pass on children). not inherit father's y-dna.
if male, inherit father's y-dna, father's y-dna, father's y-dna, , on origin. inherit mother's mtdna, pass y-dna on sons.

i understand results can vary widely, how know service use accurate? also, price no issue...

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