.

3 fans? and get 8gb ram easy

wat, 4GB is enough

.

Edited as your original title said "PC FOR AT LEAST 500 CANADIAN DORRAR"

Thank you.

http://www.logicalincrements.com/

Could cut some corners on mobo/case

.

You can also use PC Part Picker in conjunction with the link Plaisi provided. It's very popular, just click 'get started', pretty self explanatory.

Other links that might help you:- Reddit's /r/buildapc & /r/buildapcforme. The resources section on the right-hand side of the subreddit can provide further help too.

Best of luck.

i bought my laptop for ~600€

intel core i5-3210M (2.50ghz X2)
4GB of ram
500GB HDD
AMD Radeon HD 7670M

works like a charm :)