If you currently own a house, why are you looking to get a new one? What are you going to do with your current house if you do buy a new one, turn it into rental? sell it? If you plan on selling it, I would imagine you're already at your 20% and potentially more to make your down payment and take advantage of historic lows on interest rates. Personally it seems a 450K house is a bit excessive, especially with your pay, it's around 3.5x your gross salary.
Outside of the house aspect, the raise will most likely bump your taxable income into the next bracket, if it isn't in the 25% already, so I would focus on putting some money into the 401k reduce your tax liability.
I'd keep the student loan since it has such a low rate. I'm in the same boat as you there, I consolidated mine after graduation and have the same rate you do. I'll keep that as long as I can.
One thing you might want to consider with the money and savings rate you have, is go into early retirement mode since I'd bet 10 years down the road you would have enough investment income to live off of. It's a bit of delayed gratification, but if you go the new house route, you're going to be waiting a longer time to be able to retire.