Fixed Rate or AR 5/1 ... or just win the financing :)

So today my hubby entered us to win a $10k sweepstakes... :)  I'm crossing my fingers but for now without that I still haven't been able to figure out much more for qualifying in a good priced mortgage.  We did stop at mountain america credit union and talk to a broker.  They have a 100% financing loan for first time buyers and there is no mortgage insurance because its an in house loan.  Its a good rate and an affordable payment, the downfall is that we wouldn't qualify until almost december because of how many pay stubs they need, even though my hubby has a solid teaching contract (other mortgages only need the contract as proof or 1 month of stubs).  The other downfall is that its an adjustable rate mortgage 5/1, so a locked rate for 5 years and then who knows whether the rate would totally derail our life like it did so many others in this housing crisis a couple years ago.  That scares me not to have a fixed rate.