A bit good news I have peacocks and red fin zebras in a larger tank and they don't seem to bother each other
I would suggest that you buy your fish as fry and not only is it fun watching them grow, they also grow together and not killing each other for territory.
Also the more hiding places...
maybe cory's for bottom? Its really what you like?
Have a look in your lps and if there's anything you like take note and come back on this forum and some of the guys/girls here will help you with stock quantities, fish's needs and requirements.
I had to laugh when I read this, I had the same with my g/f when I bought a 3ft tank 10 months ago... she loved it now I have 3 one being a 4ft x 2 x 2
She will eventually let you get more as long as you do all the work pmsl