If you haven't already done so, you can read up on the best 529 plan on the Clark Howard's website - http://clarkhoward.com/topics/529_guide.html - there is also an option with a Coverdell account (which can also be used to pay for private school up to 12th grade), but there is a limit of contribution.
You may also want to look into U-Promise - you can register your credit cards, and have your friends and family register theirs; certain purchases will qualify for a contribution at no out of pocket cost for you.
There are also 529 credit cards that contribute a % of what you spend into a 529 account. Fidelity offers one.
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You can't keep doing the same thing and expect different results