At the moment, I'm unsure the size of the tank. I'm moving into a new flat and it depends really on the space I have.How big is your tank going to be?
It is difficult to generalize the behavior of gouramis, they can differ from fish to fish. I've never had a problem with them in my tanks, but I keep reading horror stories from other owners. I would buy from a vendor where you can return or have a re-home plan if it becomes too aggressive. The gourami should be the last fish you add to the tank.
I've had some bad luck with dwarf gouramis. I think they are way overbred and suffer from health issues. I've never had one last more than a few months in my tank, its a shame because it's a pretty fish with a lot of personality.
If you're up for a bit more of a challenge, take a look into paradise fish as well. My blue paradise is currently my favorite fish in the tank.
I'm hoping to have space for a juwel rio 180:
The diameters are:
Approx W101 x D41 x H50cm