Moving to SWN. OG
Saltwater is a bit more expensive, but it depends on what setup you want. A few fish wouldn't cost that much more than a planted FW tank--way less work, as well. A full reef setup will put you back some, but not too much more than a planted tank. Setup, as in FW, is the most expensive part. If you are patient and make the effort to maintain your tank properly, though, SW is not any harder than FW. The biggest difference (other than cost) is probably how fast things can go bad. In FW, there's a bit more 'slop', if you will, for parameters. in SW, a little shift can crash the entire tank over night. Nothing that you can't prevent, just something to be aware of.