re: What do I do with my money next?

Yes once you max out what your company matched in your 401K then put the extra money into the IRA's. You might want to shop around also and see about Interest rates on a 15 year mortgage, even if the rates are a little higher over the life of the loan you will save an exponential amount of money switching from a 30 year to a 15 year and usually your payment isn't that much more per month.

Yes, you can invest additional money in anyway (ie stocks, mutual funds etc) The tax benefits on 401k and IRA's are great but once you max those out and you stop getting the tax benefits don't let that deter you from continue to invest later down the road.