First you make a choice;
Price, or quality.
I'm not sure what you mean by "Infrared scope", as far as my knowledge goes there is no such thing. Do you mean a Night Vision Optic? Or perhaps a Thermal optic?
As for weight, chances are will weigh more than the real thing after you slap everthing on there... I know its been done before with other AEGs.
Other than that, as 10 other people are about to say read the FAQs and take a look at the "canadian retailers" tab. Between Mark at A&A and the guys at ASCA you should find every item your looking for.
By the same token, get age verified so you can shop the used section as well.
Maybe you'll find someone else to help you. Maybe black mesa... THAT WAS A JOKE, ha ha, fat chance.
My Buy/Sell 1337ness rating