My understanding is that the rack clips on the MEC panniers are smaller in diameter than a standard (i.e. Axiom) rack, so you pretty much have to buy the MEC rack if you intend to use the MEC panniers. I forget where I heard this, and haven't tested it myself, but definitely you should try it out before you buy. Are you located near a MEC so you can go in person? If so, they also carry non-MEC racks.. I forget what brand it is... but you can try and hook the MEC panniers to the non-MEC rack and see if it works.

As to the question about the Axiom Journey, that's what I got for my touring rack. I haven't toured yet, so my advice doesn't mean much. But it's rated for 60lbs and seems very sturdy, so I think it will do the job.