Yes, the Hawkeye is a lot more room for the, but, like you, I LOVE the look of a bowl so that is why I broke down and did the 2 gal. one. :)
The Hawkeye is a very good looking tank, IMO, and it LOOKS larger than 5 gals.!!! It comes with everything except the heater, gravel, decorations and fish.
As for water conditioner, I use Prime as do many on the board here. It is an EXCELLENT product and economical since you only need 2 drops per gallon of new water.
No, salt doesn't hurt them.
Here is a pic of the first Hawkeye 5 gal. tank I purchased shortly after I set it up - enjoy!
And a 2nd pic to show how I baffle the filter - same way as the other poster's pic.