It certainly looks promising, although I wasn't able to track down a Mac version of it. eBay has tons of Windows CDs though.
I did find a compiler advertised as 68K compatible called Roaster. After reading an online review, I figured $20 for a copy of it wasn't a bad deal, so I went ahead and ordered it a few minutes ago. Should be OK for the project I'm doing, but I'm going to keep my eyes peeled for the Symantec one as well just in case it winds up being more to my liking.