Here's a thought...
Would the LFS
that sold you this setup be willing to take the whole thing back for credit? If so, you might consider just handing the whole thing back to them and then taking a few months to do some research and come back to them and use the credit to buy a tank that you really want. The old adage "nothing good ever happens fast in a saltwater tank" really applies here, and I'd hate to see you rush into getting another tank just to save the fish you already have. You're not the one that put the fish in a bad situation... the LFS
did. If they truly value you as a customer, then I don't really know why they wouldn't give you a credit for 100% of what you paid - for an already set up tank that was in their shop. A credit will make sure you come back to them.
If you were looking at moving within a year, I'd just hold off setting up a tank and use the time to figure out what components you want and how you want to stock it. It takes a while for a tank to "stabilize" and begin to mature. Seems kind of a waste to set up a tank and just as it begins to settle down, you'd have to tear it down and move it. Like others have mentioned, it's no issue to move a tank, but it is a lot of work - especially if you're talking a 200g tank. But if you're looking more at the 2 year time frame for a move, I'd probably be apt to set the tank up now.
To me, it just sounds like you're hurrying to play catch up, which doesn't put you in a good spot. Like I said, I'd be more apt to try and start again from scratch and armed with more knowledge.