540"
You sound like you are a very ambitious individual, few college graduates right out of school have the ability to qualify for a mortgage buying a home. I can understand a strong desire to get the best deal. You are going to have wait so it is cost effective to consider refinancing
Good advice what "Willow wind" said by refinancing into another loan.
By looking to refinance, need to figure at least 5% of the loan balance to be attributed for closing costs. That would not be a wise move. What it would cost you in equity could be more than the $10k for first 5 years your paying the PMI.
One smart move in the future, do an in-house (stream-line) refinance. Moving from an FHA to conventional loan, yet staying with the same lender. Doing so your costs will be minimal if anything.
As for the appraisal - they are only valid for 90 days, due to changing comparable homes around your home. You do want to keep it, to compare to any future upgrades, plus something to show what is was worth at that point in time. Other than that, is has served it's purpose.
One of the qualifying factors for a conventional loan (when I was an L.O), you need at least two years of continuous work in the same field.
Piece of advice for your future (since you will be spending less than what you budgeted), send extra as payment towards principle. This will increase your equity faster and shorten's you term (an extra payment per year on a 30yr, knocks of 7.5 years off the loan). Plus you get reported to the credit bureaus as being more responsible, your reward is a high credit score. That way in 3 to 5 years you would be setting yourself up to refinance into loan with very good terms.
Good Luck
