At the bottom of the Pluto article is this tidbit:

NASA has recently said that it opposes even asking for any possible revolutionary low-cost designs for this mission that might fit in with the $650 million New Frontiers cost limit until 2005-08 -- but if Congress as a whole ends up agreeing with the House subcommittee, it can't be ruled out that Congress next year might end up ordering NASA to fly the Europa Orbiter as the second New Frontiers mission...

Why the hell is NASA opposed to finding a low cost way to get to Europa? This is probably the one place most scientists would like to study up close.