Firstly, you can't do anything until the job situation is sorted. So put all your joint efforts into getting yourselves into the right jobs for you both. Once you both have jobs then think about housing.
I would strongly suggest that whatever you buy, you buy something that is going to be easy to sell, or will be easy to sell if you put work into it. So the old mantra of "location, location, location" is the one to follow - go to the location which has the most long-term desirability, and don't buy the most expensive house in that location.
Also, try to find out why DH wants a big house/not a townhouse. Tease out the reasons, of which there may be several. Prestige? How about something smaller and historic or smaller and named-architect designed. Privacy? A smaller house on a larger or more private lot. Space for hobbies? A large garage/shed.