Congratulations!
Out of curiosity, why Roth's? At that income you should be able to do traditional contributions for both to save on some taxes.
So I just wrote an entire blogpost on why I prefer the Roth, but I will condense my main reasons:
The main reason that I think a Roth IRA is better than a traditional IRA is that you can withdraw your contributions penalty-free from your Roth IRA at any point. For a more in-depth look at IRA withdrawal rules, check out this link from vanguard
https://investor.vanguard.com/ira/ira-distribution-rules .
Let’s say you put in $5000 yesterday, and today you find an incredible real estate property(I am a real estate investor, currently own and live in a four family, and have an offer in on a three family) that requires a $5000 down payment. You can withdraw that money penalty-free.
Tip: Even though withdrawals are penalty free, you are only able to contribute $5,500 a year. You don’t necessarily want to penalize yourself by withdrawing the $20k which took you 4 years to store. However, the IRS will allow you to return any amount you withdraw as long as you do it within 60 days. Keep in mind this is considered a roll-over and can only be done once every 12 months.
You are limited to only putting $5500/year into an IRA, but $5,500 a year after taxes is like condensed money and worth a lot more than before-tax dollars. So you are effectively able to contribute more.
If your work offers you a retirement plan(401k/403b), you are restricted from contributing to a traditional IRA if your Modified Adjusted Gross Income is over $62k[single]/$99k[married]. As opposed to Roth-IRA limitation starting at $118k[single]/$186k[married].
So I know a lot of Mustachians like the idea of the Roth conversion ladder strategy, but honestly, I want there to always be cash flowing in even after I retire, whether that be rental income, or money from my AmazonSeller fBa business, or another entrepreneurial venture I come up with. So I don't want to bank on me being poor to take advantage of the conversion ladder when I retire.
Anyway would love to hear feedback on my reasoning. And Moof this year instead of contributing to a traditional tsp(401k), I'm switching to Roth TSP(401k) because I had another baby and I plan to close on another investment property which will need a lot of initial capital Improvements. Probably again placing me with a low effective/marginal tax rate.