honestly, the one thing that I wish that I would have paid more attention to is, make sure that your mortgage doesn't have any early pay off penalties... mine has them where I have to pay 6 months interest if I pay off my mortgage early.... so... next year when I get married, we have no choice but to stay in my house for a while or we'll be paying out the wazoo to get out of the loan...
Also, really look into 80/20 loans... My opinion, it's the best way to go... oh, and as said above, get a fixed loan.
only other advice would be, don't get the most that you can afford because then you'll be living pay check to pay check, and make sure you want to stay there a while.