I was looking at the 17.5 gallon and it is 24" in length so it's a little bit longer than the 20" Fugeray that we have. i think I can adapt the moveable legs to fit. I guess I should have gotten the Ray2.
The rimless look is pretty neat.
The output of the px360 probably won't cut it for that size of a tank. So I think you will need to upgrade your filter as well (just go with an HOB). As for your lighting I'd go with a Ray 2. It also all depends on your plants. If you just have Anubias and java fern... Well keep the old fixture.