hard drive (HDD) based, high definition camcorder, be aware that if you shoot video in standard definition, the resulting highly compressed MPEG2 files need to be translated/converted using StreamClip before iMovieHD or FinalCut can do anything with them.
If you shoot video in high definition, the resulting even more highly compressed AVCHD encoded video can be used only by the most current versions of iMovieHD or FinalCut capable of using AVCHD encoded files.
Once the video is in iMovie or FinalCut and the editing is done and you are ready to burn a DVD on your Mac's SuperDrive - so the DVD can be played back in any "regular" (standard definition) DVD player, iDVD and DVD Studio will take care of making sure that DVD uses the right codec and compression. If this video started as high definition, iDVD and DVD Stuio will downsample to standard definition. There is nothing special for you to do.
If you want a DVD capable of playing in high definition, you have two paths:
1) Export the video project as an AVCHD data file. Burn that video data file to a DVD. From what I understand, this can be played back using a PS3.
2) Get a BluRay burner connected to your Mac and burn the DVD job as a high def file to be played back using a BluRay player attached to your HDTV.
The blank discs are a bit expensive
For reasons I won't repeat in this thread, HDD is not something I would recommend... At this point in time, first choice is miniDV tape (uses musch less sompressed DV and HDV), second choice is flash memory (like HDD, uses MPEG2 and AVCHD). All other consumer video data storage types (HDD and DVD) fall off the list.
I'm looking to buy to upgrade from a High 8 camcorder to a digital model. I don't need anything special, just use it for home movies etc. From everything I've read, I think one with a hard drive would be best for me, but I'm trying to see if I should go with a HD one or not. Is the price difference worth it? Also, I have a MAC computer. Are most of these cmacorders compatabile with MAC to burn DVD's or will I need a new burner?