I could use a little math clarification here. You list your monthly outflows as such:
Spending- 2700
House fund- 2500
IRA- 1000
Taxable- 400
That sums to 6600, which is 1000 less than your take-home income of 7600.
Furthermore, I feel like you're missing things from your budget- do you ever buy clothes, for instance, or go to the movies? There isn't any kind of entertainment or shopping listed other than a few specific line items. The vague amounts for food/eating out also make it seem like you're guessing on those and not actually tracking spending. So that's something you need to do- you can't understand how you're doing financially if there's hundreds (thousands?) of dollars of spending out there that's going unnoticed.
Onto the budget itself. You're two people living in free housing and you're still spending 2700 a month. That's ridiculous. Yeah, a lot of it is loans, but you've still got some major fat to trim. That food budget, for instance, is totally nuts- ignoring loan repayment, literally half of your spending right now is on food. You could slash that by half and still be living very comfortably. Same thing with the AT&T bill. You're being robbed blind if you're paying that for a two-person phone plan. And what is that $121 to Apple? Did you buy a laptop on layaway or something?
Re: investments, fund selections look superficially reasonable to me (though that GTLOX is a bit pricey). Other folks would be more qualified to comment on your asset allocation.
Overall, I think you folks could retire a fair bit sooner than 55, if you make some reasonable spending adjustments and don't go house-crazy. But you'd have to get serious about budgeting first.