Most of the Tamiya kits, like the Skyline one you mention, are ok for mucking about, but when you come to race, you'll have to upgrade it. Personally, I would try and find a local club and go along and see what they race their. Car park bashing is only fun for about ten minutes, and then you'll want to race.
Its better to buy a car supported by your local club, as then you have access to spares, set up tips etc.
Where abouts are you from?