For a house priced from 300k to 400k now, it is very possible the price will go down at least 5 % in one year.
So if you buy a new house now, you can only move in one year later. At that time, you house are deprictaed a lot. The bank will ask you pay more down payment. If you are not luck, you lose your job, you will be in big trouble.
Of course, if you are sure you are luck or you have enough cash in hand, do not mind to lose some, this is no problem.