The best workshop in the world is the one that you are working in!
I know that there are people who complain about their work space - it is too small, the machinery isn't set up for proper work flow, there isn't enough storage space, the lighting is poor, not enough heat, etc., etc., etc., but in those spaces these same people produce wonderful work.
Ten different work shops, or so, I have lost count, have served me well. My first workshop was a barn that my grandfather had built, I couldn't control the heat or humidity in the space but I didn't let that stop me from making mountain dulcimers. My smallest shop was six feet wide by twelve long, it held a workbench and a bungee powered lathe that help me make dulcimers, wooden top banjos and buckets of spoons.
I have built two "dream shops" only to move away for different work and jobs once the construction and finish was completed. Yes, I have bitched a little about losing those dream spaces, but I moved on and found other places. For the last two years I rented shop space at 40 West Art Studios in Lakewood, Colorado, it was great to share a building with other artists, the rent was reasonable, but I faced a 15 minute commute depending on traffic and weather. Two months ago, I left the studio and moved into our spare bedroom where I have to contend with forced air heating that makes humidifying the room a hassle. The spare bedroom isn't an ideal workshop, if I want to use a table saw, router or air compressor I have to go out of the car port storage, pull out those tools and set up in the driveway.
It may sound like I am complaining, I don't mean to because I am very grateful to work at home, I get to have lunch with my wife every day, take walks and play with the dogs when I want and enjoy the fact I don't have drive the wild, crazy, crowded streets to a shop.
I am grateful for everyday.