Any of the ones you listed would be allright - availability of getting them may be difficult however.
There are a couple different ways you can go. You can get the factory rifles and build off of them. These guns would include guns like:
Anschutz 54,
Rem 40X
Win 52,
etc
OR you could look at a complete custom action such as:
Time
Hall
Turbo
Swindlehurs
etc
Any of the custom actions will likely run around $1200US or so. They are superior to the factory made guns but I don't know if it would be completely worth it. Furthermore it would likely be difficult to find one in Canada and importing one may take time and $.
Anschutz is nice as they are a fairly recognized brand and therefore there are more parts and accessories made for these guns. Lilja for example makes a drop in barrel for the 2013 model. One problem with the anschutz 54, if I am not mistaken, is that they are pinned into the action, not screwed. If I were to make a benchrest gun from an anschutz I would look at getting the action screwed. It will be much stronger this way and you will likely see a bit of an increace in accuracy.
There seems to be many trends out there for barrels right now. I do not follow it as closely as I used to but I do know that there are lots of options out there. You can go for 1:15 or 1:16 twist, reverse taper, 6 groove, 2 groove, etc. Each has its own advantages but takes a lot of research to find which one will fit you best. 1:16 in a regular taper with 6 grooves seems to be a pretty safe bet though. There is of course the differnet barrels out there. Seems a couple years ago benchmark was THE barrel, but there are so many out there and I really don't think you can go wrong with any of the high end custom barrels including hart, shilen, lija, douglas, benchmark, etc.
I was in a similar boat about a year and a half ago. Looking for a real competitive benchrest gun. Finally landed on a Winchester 52D custom (mcMillian Light benchrest stock, hoehn tuner, and other modifications like the action had been blueprinted and trued and the gun had been set back and rechambered, etc). Overall this gun shoots really really good. Will shoot with any gun I have seen so far in Canada (maybe Jeff will have something to say about that though!) However, right now benchrest shooting is not a very popular event in Canada. There are no major competitions and it won't really get you anywhere. The best you could do right now would be to find a club that has benchrest shoots, or compete with it down in the states. I figured this out and after being told by a member on here that I should look into the 3p type shooting I opted to give that a try. Much more opportunity than this and after less than 2 years of shooting the 3p match style of shooting I have allready had the opportunity to compete in India at youth commonwealth games and shoot in a number of provincial and national style shoots. Not that I don't like benchrest, just not as many opportuniteis in it so you may want to think about this before dumping a whole bunch of money into one!
Hope this helps...

Jordan