wizcraft i see the cowboy 3200 is the smallest you recommend. 3 layers of 9-10 0z leather would be about 1/2 inch and the most a holster would require i think. 
read your machine series and made a list of the important features thanks, 
triple feed, smooth feed dog,right toe jump foot, narrow slotted jump foot, edge guide, #25 needles and at least #138 to 207 thread , servo, cylinder for small shapely holsters, lg cap bobbins. These things all make sense, and are available features of the cowboy 3200? 
will i find a lightly used one any where? 
Dan