Couple of thoughts/responses:
Why no interest in the Roth? I agree that if you aren't making six figures and have paid off a $170k house at 30, you probably don't need to do anything beyond maxing two 401ks for retirement. But the Roth is a pretty good place to put an emergency fund, and it also give you the opportunity to do some tax arbitrage in retirement. based on what I assume your spending must be, assuming rates don't go up (or really, exemptions/standard deduction down significantly), you can probably life on tax free withdrawals from your 401k, but if you want more spending than that, you can top it up with withdrawals from a Roth, essentially making that 401k money never taxed.
Doing a Roth now also will make it easier/more tax efficient for you to set up a Roth conversion ladder if you want to retire before 59 1/2. (Also, pretty sure the Roth conversion wasn't eliminated; the ability to recharacterize was. This won't be an issue now since you aren't making six figures (unless both you and your wife make high 5 figures and combine to bump up against the limit), but just FYI for potential roth conversion ladder in the future.
W/r/t 401ks, I'm unclear whether you're maxing that out or not. If you aren't, I would. Again, with your relatively low spending, you can potentially turn a lot of that money into never taxed money.
Don't buy real estate at a market peak just because interest rates are low; if you wanted to play that game (I'm assuming somebody that focuses on paying off their mortgage wouldn't be), it'd be better to do a cash out refinance with your house, put that money into some high hield savings (there are credit unions paying 4 or 5% interest now on up to $250k if you can qualify for them, so it would be almost a break even proposition other than closing costs), and do a cash purchase of real estate when the interest rates go up and drive prices down. That way, you get low interest and low prices, rather than low interest rates in exchange for high prices.
If you do purchase rental properyt now, don't just use a cash out refi b/c of rates; yes, you'll get lower rates, but your interest won't be deductible unless you itemize. So compare the savings from rates to the savings in taxes (may not be much if you use 401k contributions to keep yourself in a low tax bracket, but still run the numbers).