In addition to what Tab. said:
Ripping:
Fairmount is worth a mention, it is free (it is included in DVDRemaster demo - which you don't have to install). It works well - it mounts the DVD as a proper data disk from which you can then grab whatever you want, but it is also very slow.
NB: The latest version of Mac The Ripper that is "easy to find" is 2.6.6 but I don't think that it is Intel compatible. If you are considering MTR (and v3) then you will want to go to
the MTR fourm at RipDifferent.
Converting:
MPEG Streamclip is also worth a mention, although as it uses the Quicktime stack you have to make sure that you have the MPEG2 plugin if you want to work with MPEG2.
Up until recently, I have preferred
ffmpegX, the UI can be a bit odd at times (such as when adding subtitle streams) but I like the batch handling and have gotten good results with the MEncoder "plug ins".
Tab., why don't you like it?
I have just started playing with
Avidemux it reminds me
a lot of VirtualDubMod (side by side view, filters, scripting, etc). It looks good, but as I said - I have only just started playing with it.
Editing:
I use FCP (and love it) but don't forget that Mac's come with iLife installed, and that includes iMovie which isn't half bad, and the new version of iMovie supports HD. I'll admit that you are pretty much stuck with editing in DV (or HDV in the new versions case), but what is the problem with that?