When do you renew your lease? It seems to me like there is no hurry to buy until (if) your LL jacks up the price of your apartment. With that in mind, I would consider hedging your bets by fulling funding your IRAs and 401(k)s, with the thought that, if the rent goes up or a good property comes along, you withdraw from your IRAs. BUT, I would set the bar really high for withdrawal from your IRAs at this point, and as time wears along, lowering the bar. Contributing to your retirements at the same time, though, so you don't lose any of the value of having it invested.
The reason why I suggest this, is that you may find yourselves in a different situation in 2 years, where you don't want to stay, so you haven't lost the ability to make your contributions for 2013, 2014, 2015. But if you do decide to stay, the money will be there. I would also try to cut from your expenses (if possible) in addition to maxing out your retirement accounts.
The big factor that would deter me from this plan is if your 401(k) investments are poor investments -- if your investing options are limited to the point where you wouldn't have chosen any of those funds if given the choice. If that's the case, then I would reconsider maxing the 401(k), because if you withdraw all your IRA funds that will be all you're left with in retirement savings.