Consolidating would be good for the debt to income ratio... however with 15-20% down and strong scores I think you'll find that a higher than normal debt to income ratio should qualify just fine. I've seen debt ratios into the 60% range get approved with your stats.
Also keep in mind that your credit will need to be re-checked before you close, as credit reports are only good for up to 180 days on new construction (120 days on existing homes).
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