So, I installed XLD at the weekend (thanks to those who suggested it) and experimented with ripping a CD to different formats (aiff, wav, flac, alac). I like the way it gives a log for the rip, that in my case showed no errors. I also like the way you can do a check on an already ripped file, which showed that the files I dragged and dropped also have no errors (though with an offset that I don't quite understand).
I would wager that these are all exactly the same, bit for bit, so it comes down to which format is most convenient and future proof. The lossless compression on a couple of them (flac, alac) is a nice disk space saver, and flac is most platform neutral, though not supported by iTunes.
However, to be frank, I'll be damned if I can hear any difference between the several file formats and the 2 apps I'm using (Amarra and Decibel) in my system, which I think is fairly decent (Mac -> Halide DAC HD -> Theta Casablanca -> Sunfire amp -> Von Schweikert VR-33 speakers).