Ok, spring's coming and I want my baby to shine! I have a BLACK '98 csvt. I've read all the posts where everyone sanctifies Zaino. And I'd like to use it. BUT - my car gets stored outside year round in Ohio weather for lack of a garage

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So what I want to know is: For this situation, is it worth shelling out the dough for the Zaino or will a lesser waxing product do (since the car is stored outside anyhow). I just don't want to spend the time and money if the weather is going to defeat me in a few weeks time anyhow.
Also, I bought the car about 4 months ago and do not know how it was previously waxed.
Thanks for the advice!