@Steven N.
Welcome to BP!
You have made a wise decision to post here and ask for help!
You are fortunate to begin with such solid financial resources. I can only assume that because of the percentage of money that you are willing to dedicate to real estate investing, that part of your long-term plan is to leave a legacy of wealth for your growing family. In order to achieve that goal, you will need a long-term plan dedicated to a certain end-result.
While I understand the appeal of wanting to buy new houses that are seemingly affordable with little to no maintenance required (in addition to a 10-year warranty plan), a critical part of real estate investing means planning for the future, unexpected costs, the best ways to maximize your capitol and cash-flow. This means seeking out deals under-market value, that are easy to maintain/easy to rehab or update (as it seems you are looking for something more turn-key), that are easily rentable and will appreciate well. Frankly, new homes are not the best bang for your buck. In 10 years, the warranty will be gone, they will need updating, in addition to the damage done by 10 years of tenants.
Perhaps try to expand your reach- try out other housing markets besides new homes, and just see how it feels., You may be surprised at how comfortable you feel purchasing an older home that has been well-maintained, rents for a similar amount as a new home, but is 50k less, simply because it is older.
Here is a brief (very brief) overview of the finances...
Let's say, as an example, instead of buying three rental homes @200k, you are able to buy four @150, and allowing you to have even more money set aside for the repairs, or even another investment property, should the right offer come along. Additionally, you would be spreading any losses over four properties instead of 3. As an example, should one of your tenants vacate (or you are forced to evict them), you would still have 75% of your properties cash-flowing as opposed to 60%. Again, these are just loose numbers to give you a different perspective... It all comes down to numbers, and which numbers will give you the results you are aiming to achieve.
What is your end goal? How much money do you want your properties to generate? What makes you feel secure? We all need an end-point.
Most importantly, set definable goals that you can reach along the way. Think of them as stepping stones to the future.
You have a solid starting pointing, now all you need is road map to get you to the life you have imagined living, and the legacy you wish to leave behind.
Ultimately, you have to do what is right for you.
We are here to help!