Lizabeth, I have decided to get off the fence and have ordered a 37 marker y-dna test from FTDNA.I also took a giant leap (for me) and asked FTDNA if they would establish a Linthicum surname study group which also involved "volunteering" to be a project coordinator. At the same time I ordered a book, "DNA and Genealogy" by Colleen Fitzpatrick (available at a reasonable price from a link on the FTDNA site) to see what I just got myself into.
To all other Linthicums (and variations).Even if you have your Linthicum lineage all sewn up and buttoned down.Your (male Linthicum surname carriers) y-dna profile can help others in their searches and over time could actually enhance our knowledge of our origins across the Atlantic and maybe even beyond.
Will update as anything develops.
PS I am not a shill for FTDNA but there are 5 more (soon to be 6) Linthicums with DNA profiles there than any other place that I am aware of.