Using a lackluster barebones and "kid friendly" program to basically "sell yourself", is only selling yourself short.
There is ALOT iDVD can not and will not do, that DVDSP can do, and IMO do it easier, quicker and with less fuss.
YES, DVDSP is not for idiots and you have to be very careful as you author your disk. Last thing you want is to have one of your buttons go to the button to the left when you press right on the remote. Things like that, though slightly automated in DVDSP can be a nasty downfall.
But iDVD, doesnt let you have creative control over menus, like DVDSP does.
And in all honesty, if you are making a digital portfolio and the DVD it is on isnt part of your portfolio, you are losing out.
Take your time, DVD portfolios can be just a list, or another piece of art.
In the very real sense, you are going to be offering a DVD of your work to someone to possibly hire you. You would want them to be as WOWED as possible, and I dont think using iDVD is the way to go.
Think of it this way. Digital artists all know the tricks of the trade. I cant count how many Apple Sound Loops I hear completely unedited on television. Or how many LiveType presets without any customizations make it into commercials and porno.
In other words, if the person you arre showing this DVD to, knows iDVD he will be able to spot it right away.
When someone makes a movie in iMovie, the general audience is wowed. But those who know of iMovie know it took 2 seconds and absolutely NO talent. Is that what you want possible employers thinking of you?