My recommendation is to drop Peak 4 - it's limited to 2 gig files for recording and that'll only give you an hour at 24/96. Get Spark XL instead.
I beg to differ on Peak, but as I've stated in other threads and lists, the problem is not so much a Peak problem, but an industry problem. Both the AIFF and WAV format are limited to 2 GB. Spark XL gets around this by simply ignoring the standards, we could debate the merits of doing that, but I won't. I'll simply state I didn't care for the Spark interface and thus didn't find it very intuitive to use.
Now back to the question. For DVD-Video discs (24-bit/48 K), I'd recommend Toast Platinum. If for no other reason, it pretty fool proof as far as burning audio as 24-bit discs that can be played on DVD player. That said, if you want to use 24/96, Toast won't do it for you. Neither will iMovie/iDVD, both are limited to a sampling rate of 48K. For 96K, you need to jump up to DVD Studio Pro. I have a comp. Copy (use to work at Apple), but I haven't found the time to figure out how to do the 24/96 in DVDSP.
If you want an easy way to burn 24/96 as DVD-A discs (not compatible with standard DVD players -- they must support DVD-A), you can use DiscWelder. After the last update they sent me, I haven't had any problems with the product, so I can recommend it.
If you have any problems, let me know.
Wayne