We use Solidworks here and I am a huge proponent. I know ProE is a more capable but also more expensive I believe.
The professional version of Solidworks which I have here at work is $4000 or so, plus subscription costs. I got an educational version for my son to learn on at home ($130 at AcademicSuperstore.com) so he could get a decent summer job while he goes to college. You can also get some pretty good tutorial packages for it.

What I love about SW is the sheetmetal package which I have been using to play around with on a front bumper design. You can build a solid bumper, shell it out to say 1/4" thickness, then convert it to a sheetmetal part and unfold it! Very cool.

Like Matt says, it's pretty user-friendly, but there is still a good learning curve (2 weeks or more) before you can become productive.