Hi Giorgio,
It's all fine and well to learn to fly trikes with a 503 and a Wizard wing, but if you have any aspirations to do some X-Country when you get up a few more hours then you will find the Wizard wing rather limiting. As soon as any wind appears in opposition to your desired direction of travel your groundspeed and fuel range plummets. You may find yourself wanting to upgrade to a Streak wing and then find you need the extra power of a 582 motor to fly the Streak wing.
Some instructors may push you towards learning on a slower wing like a Wizard and that learning on a faster (50kts hands off trim) wing is like learning to drive in a Ferrari. This is Bollocks in my opinion. You will learn whatever you fly, and safely with the instructor in the back seat until he is happy you have learned to fly it sufficiently to start your solo circuits.
On the other side of things, the slower wings are better for just boating about and for shorter airstrips/paddocks and are usually simpler to rig due to having fewer battons.
If you live in a warm climate then there's no real need for you to have a pod, I recommend a good 2nd hand Outback 582 which can take either the Wizard or Streak wings. If you fly in a cold place like me then you need a pod to keep most of the wind off you, then a good 2nd hand Classic (also 582) would be the go. If you go for the 582 motor then you at least have the choice of whether to use a Wizard or Streak wing, depending on what you want. Another point is the Wizard wing will be more affected by turbulence and cannot lose height as quickly when you want to, ie, sudden thermal on approach at the end of the runway.
In the end it depends on what you intend to do with the trike and if serious XCountry is not in your future plans and you just want to float up and down the coast then you could save yourself a lot of money getting something like a Redback.
Cheers,
Glen