I've been using DVD Studio Pro for several years now, going back to v.2. Thing is, DVDSP is not available as a stand alone program anymore. Not legitimately anyway. It's been folded in Final Cut Studio. Which, I happen to run on all 3 of my Macs.
To answer your original question, if you buy a mac you'll get iLife. It's a bundle of 'i' apps. iPhoto, Garage Band, iWeb, iDVD, iMovie. iDVD *may* do some of what you're looking for in a DVD program. I do seem to remember it kinda does it's own thing as far as encoding goes i.e. best possible fit for the space available or the like.
A ton of Mac related video info here:
http://www.pure-mac.com/video.html
If there's something you (or anyone else) would like to know, I'd be happy to answer any questions you or, anyone else, may have about DVDSP or anything else video for that matter. I'm a long way from knowing everything but I have been making video for about 20 years or so now.
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