This may make feel better about your decision to purchase the 200k house instead of the 400k house:
In my personal experience the cost of owning a house that costs twice as much to purchase will have ongoing expenses commensurate with the price/size. Expenses like mortgage interest, property taxes, utilities, insurance and ongoing maintenance. 8 years ago I purchased a home for 217k and a home for 114k that are 3 miles apart but in a different phase of the community. I live in the larger more expensive of the 2 but personally pay all of the expenses of ownership and handle all of the ongoing maintenance for both.
Over the last 8 years the value of the less expensive house has increased at a higher percentage and the expense of ownership has been roughly 50% less. If I were to sell both houses today my ROI on the less expensive home would be much higher than that of the more expensive house.
From my perspective you made a sound financial decision.