I think your appraisals are far too low for an end user.
It's pronounced fizzy, of course.
So if someone wants to be called this SUPER DESIRABLE ONE WORD, and brand it, their choices are:
Fizzy.com
Fizzi.com
Fizi.com
Fizy.com
Etc..
And bringing up the rear of still the top possibilities, fzzi.com
Have ambition!
Could offer it to a poor end user for $1000 and then $100+ per month for 2-3 years. Good luck!