How much do prices on pcs drop on boxing day?

I live in BC, I have like... $500 to spend, im trying to get myself a computer that's got at least 3 gigs of ram, at least an NVIDIA 6150 SE video card and i dont really care about hard drive sales. I found a computer that's 380$ but it dosent come with a monitor, sSO.. I found a monitor tthat's79.99 that I could get. so together that's $459.99 then theres tax! 12 % of that is 55.20 sSO... now we are at $516.19. WHAT AM I TO DO! But then theres boxing day... does anyone think the price will drop at all? like $100 bucks? or aat least$75? Im 14 and ive been saving up for a bit and i have $100 bucks... im just hoping I get enough tho.Im also hoping to buy cataclysm wwhichis 40 bucks. so 566.19! do you think the price will drop? my alternative option is to buy the refurbished version of this computer or a similar computer for $100 less but Id have to order online from the future shop site. What ever shall I DO?