If you are really itching to go shopping, I would go for the wet suit - nothing like owning your own. And because I have small feet, the fins was a good investment. But I think that you should try different gear before buying - even masks... see what you like.
Also, you have to consider where you will dive. I live in Canada, and dive in the Carribeans. So I don't really want to have to carry a lot of gear in my luggage... especially since, so far, all the rentals have been really good. But again, I do love my wet suit! I am comfortable when I dive. AND it sure beat slipping into a humid one that was worn by someone else the day before.
Cheers!
Lyne Marie