Real Professional Racing Teams?

[dwk]

Just out of curiosity I was wondering if there are any teams in the junior formulae (F-Renault,F3, F3000) that attempt to run themselves as real professional racing teams or if almost all of the teams are simply rent-a-ride deals. By this I mean are there any teams that make an effort to actually go out and seek sponsorship for the themselves so that they can then find the best driver, or do they all just depend on what the drivers can bring them?

I realize that the cost of racing in these formulas is way out of line with the exposure received so sponsorship may be a very tough sell for a team but I know that in the NASCAR Busch and Truck developmental series that teams find their own sponsors (although these series do have a lot to offer). I also realize that some teams are aligned as junior efforts of bigger teams and can get sponsorship that way.