[thefro526]

Just to throw another opinion out there: From my experience, it doesn't matter what system you use as long as you're comfortable using it. I'm relatively competent with each of the big three; Inventor, Solidworks and Pro Engineer (Which is now Creo after WF5, I think) and have very few issues switching between the three.

ProE is probably my least favorite even though it's the only program I have formal training on. I've always found the interface to be a bit counter intuitive (especially when learning), but it's more powerful than Solidworks or Inventor so I guess it's a worthwhile trade off.

My personal favorite is Inventor because I know it the best and I think it's easy to learn and/or teach.