Marco,
All I will add is that if you are more into the driving than the building, look at the classified section here on this board and over at
www.cobracountry.com. If buying a complete car, I'd look for a one or two year old low mileage car. You can find a great SPF, Unique, FFR and others now in the $30s...COMPLETE.
If wanting to build, well, there's tons of choices available.