All of those states offer great 529 plans, though to be honest, there are many more great options out there. I don't know that I can necessarily agree with your short-list (not sure what OA is!), because there are a number of inexpensive plans out there giving those you've listed a run for their money. Really, though, you should start with Connecticut, especially because you want to Superfund.
Contributions to a Connecticut 529 plan of up to $5,000 per year by an individual, and up to $10,000 per year by a married couple filing jointly, are deductible in computing Connecticut taxable income, with a five-year carryforward of excess contributions (rollover contributions are not deductible). So if you're superfunding and using an out-of-state plan, you're foregoing some significant tax benefits- to the tune of 0.17% annually, according to our state tax calculator (assuming $70k contribution and $200k in income).
So as a superfunder take a close look at Connecticut before deciding to move forward on an out-of-state option.
Brian Boswell VP, Research & Development
This information does not constitute tax advice and is provided for informational purposes only. Please consult your tax advisor, financial advisor, local taxing authority, and/or plan provider or sponsor for more information.