As always 777s words are on the mark...
http://www.atpflightschool.com/
They have a solid program. The company has an good rep. Just take their PPL and 90 day program - you don't , IMHO, need the other stuff.
I you havent put money away, I recommend entending your enlistment and putting a good 1K+ away a month for the duration. It will help you pay down the loan. Ideally you want to have no debt , but it may not work out like that...
One last thing - IMHO, the GI BILL is better spent on a 4 year degree. If you already have one, use it for a MBA / Masters and a certification (like financial planning) rather than flight training...
Good luck,
LAFF