The Daytona is a good choice for a jet, mine seats 4 easy and possibly a 5th in the middle seat in the front (if it is a kid or someone with small hips
I've seen a couple of tunnel jets that claimed to be 22', i.e. Placecraft, Rapidcraft Twister but to me they didn't appear to have anymore freeboard or substantially bigger then the 21' Daytona. I would love to see someone build a bigger jet with a decent motor to see how it performs, there is some experimentation going on with dual jet drives in lager boats, so who know.
Here are a couple of pics of my interior