Kenneth, I have two Davis Vertical Feed machines. One is the original Davis Vertical Feed, which takes a special Boye #10 or 1x2 needle. Those needles are harder to find, obsolete and usually very pricey. They can be found on E-bay. The shuttle and bobbins are also pricey.
My second Davis is the New Vertical Feed, which takes normal everyday 15x1 needles.
If you get the Davis, you will love it! That is the greatest machine for putting binding on quilts as it has no feed dogs so the foot 'walks' the fabric without bunching or puckering the thick layers! I use my Vertical Feed Davis for that purpose only! You will get a work out, though! It is the hardest to treadle - I mean in using muscles hard - that I own!
Nancy