Since you don't plan on having a 3rd- definitely use Ari no matter what. You obviously love it- it is a unique name and I fear you will regret it if you don't use it!
I agree. Even if a third bub comes along you'll most probably be ready to choose another name by then! So don't let others put you off... sometimes it can be a mistake to ask opinions - I've learnt that lesson the hard way ...

I'm going to stick with adding an H to it tho - my favorite way to spell it would be:

Ahrie

easy to say, and it looks "girly"...