Sawfish you where do you live? King has the 21inch in Canada. With the exchange rate it would be a good deal if you are near the border.
I have EX-21 (Excalibur) for over 7 years now, It is the best decision I ever made as I am a fairly heavy user at times and have only replaced blade holder once. I have had friends who have gone through 2 Deltas in that time.
Parts should be available from King or from Seyco.
16 inch?? It depends completely on the type of ornaments you do. For my stuff, it would handle most of what I do. Lots of ornaments and keychains, baskets so you would have to think about that.