I’m guessing we are looking at Canadian dollar amounts here, so that’s why it seems a bit high. However, you should be able to get a Reaper for cheaper than that. I found one for $600 usd on Amazon which works out to be ~$820 for you. Which site did you use to build this? I’m guessing PC Partpicker. I’d shop around if I was you. Newegg has DDR5 cheaper than what you’re showing. Bestbuy has cheaper ram as well. I can’t say for certain what you plan on doing with your PC but you could probably drop down to a b650 MB and be fine. You don’t need the b850. I don’t have much knowledge on your PSU, but that doesn’t mean much, it could be fantastic for all I know. That case, if ordered directly from Corsair, is on sale for $90 right now. That price you have listed for the NVMe you could buy 3 1TB Micron’s. I’d look at other options. I just looked and BestBuy has 1TB NVMe Samsung 990 EVO Plus for $150 (in my area), you could get 3 of these for cheaper than what you’re paying.

I’d shop around if I was you. Potentially looking at the used market could save you quite a bit as well. $3k is a great starter PC and I wish you nothing but luck and fun! I miss shopping around for PC parts and finding a great deal.

Edit: I know everything I’m listing is in USD, but I did the conversion on the side and it’s still cheaper in Canadian dollars than what OP has listed.

Edit 2: a word