Toyota had a grand 5-year plan when they first embarked on
entering F1(I do not know if they've actually put that in place,
especially given their less-than-promising - by the standards
they'd set for themselves - achievements), but no one comes close
to touching Ferrari/McLaren's budget which comes close to half a
billion annually(have you got the figures for the other big
players? I'd be keen to know their budgets. 
). Prior to Toyota's entry, BAR had the third
largest budget, although their results not commensurating with
their ambitious goals resulted in them cutting back on their
spending subsequently(started with the release of Jacques
Villeneuve I believe).
Renault F1 operate on a budget similar to Benetton's and Benetton
were never world beaters in fiscal terms even in their heyday when
Schumacher took them to the back-to-back titles in '94 and '95 - in
a nutshell, the success of Benetton and now Renault can very much
be attributed to Briatore's eye for talent. Just as he made the
bold decision of plucking an untested Schumacher from Jordan - in
fact, right under Eddie Jordan's nose which explains the
hardly-cordial relationship the pair shared when both were still in
F1 - after just one race brought Benetton success of unprecendeted
proportions, he has made the same decision with Alonso which has
reaped handsome dividends yet again...
Right, saying that, I'm no fan of Schumacher who, in my mind,
remains one of the most unscrupulous - albeit successful -
characters in F1. 
