If you can afford it, you can build an excellent custom rifle that you can grow into. Insite Arms would be the builder of choice for PRS rigs in Canada.
The advantage of a custom rifle (if you go with the right gunsmith - big if here) is the meticulous attention to detail - especially on the chambering and threading of the barrel, any cartridge you want, essentially an unlimited selection of components, QA/QC and customer service if something goes down or isn't too your liking. These rifles will generally have the highest degree of precision - perhaps not necessary in PRS when shooting 1-3 MOA targets, but it's fun to shoot tiny groups and have 100% absolute confidence in your rifles ability to shoot. You can also build a rifle that 100% fits and is tailor made for you - but you need to know what you like and dislike in a rifle, and this can take a few iterations and years of shooting the sport to get completely dialed in.
For the budget end on this side, a Kelbly Atlas Tactical action in a KRG Bravo is perhaps one of the most budget friendly. Defiance Tenacity, Bighorn Origin and ARC Nucleus are other actions worth considering as well. If you have the budget, then Defiance Deviant, Impact, Lone Peak Fuzion, Bighorn TL3, ARC Mausingfield, etc are all excellent options. Then of course you have an array of stock and chassis options, triggers, etc. This will all be personal preference. If I was building and unlimited budget PRS rifle in Canada, it would be Insite Arms building a Impact or Fuzion action, in a Foundation stock with a BnA Tacsport 2 stage trigger and Krieger barrel.
For the utmost budget conscious person, factory rifles will be the most budget friendly options. Barrels and the chambers are mass produced, while accuracy is good it's generally not to the degree of a custom rifle. Limited chambering options, and of course you are bound to the factory rifle configuration unless you want to spend money to upgrade components. Some factory rifles are built better than others, but they will all produce the odd lemon.
For factory, I think the best option is a Tikka placed in a KRG Bravo chassis. Other good options are Bergara and Howa. In these, I would recommend 6.5 creedmoor. You can slowly upgrade the rifle with aftermarket trigger, custom barrel, etc. as you decide what you need as you learn and progress in the sport.
There's lots of options for most any budget, and like anything else you get what you pay for. The law of diminishing returns also certainly applies the more you spend on a rifle.
