In the land of the Yank, only the F-22 is considered a step-change aircraft - not JSF. However, the JSF is often quoted at being much cheaper due to the way costings can be slewed by including possible cuts in production, one-off development costs etc. The F-22 is far more at risk than the JSF in the US.
JSF is also still donating technology to F-22, particularly its SAR. It'll be the daddy of carrier aircraft for sure. You have to look at through-life costs. The STOVL will cost less in the long-run, end of dit, while still providing super-cruise etc.
We won't be buying any Grippens, but we are already nicking some tactics off 'em - eg passive/active attack etc.
Rafale is about as likely as me winning the lottery.