If you like your King 16 inch why not the King 30 inch? Here is Canada the 30 inch just went on sale for same price as the 21 inch. These are Canadian Prices so they are way more than US$. Here in Canada the cost of a Pegas 30 inch is $1,874 so even with the new Pegas Blade Holders (if you think you want them) it is way cheaper.
Food for thought, Steve Good posted awhile ago that 96% of his patterns could be cut on a 16inch and it would be possible to cut the rest with multiple holes.
If I was in the US I would look seriously at a Seyco 21 or 24. I believe that Charles Dearing who does a lot of large portraits and pictures uses a Seyco.
Quote from my presentation on Scroll Saws
BUY THE BEST AND CRY ONLY ONCE