It's an interesting discussion. In theory, a 19T class would be ideal. Good speed, not too demanding on equipment, excellent motor variety & supply available, batteries are not a huge factor. I for one would happily run 19T at any event that supported it PROVIDED I would be racing against more than 2 or 3 others.
Dan is right though, there are too many events, too close together & ultimately, racing in general suffers as a result.
If there were some sort of ranking system to "push" guys out of stock, then perhaps 19T would become more viable. As it stands, unless someone goes to mod voluntarily, nothing stops people trophy hunting in stock.
Have a look at the Winterchamps thread & see what the uproar in pullstart is all about. Guys who should be running open anyway are spitting the dummy because they are being forced out of pullstart & into the "D" final in Open. Same theory applies here.