Replying to Where to buy laptop online Canada?

hey guys, So my 3 yr old acer is starting to show signs of its age, with excessive heat, redundant battery and lots of flex.
it is 4gb ddr2, 1.6 core duo, 160gb 5400rpm drive .

I am in search laptop but am struggling to find good deals online (canada). Any ideas?

I want 4gb ddr3 intel core i3/i5, dedicated gpu (do some hd avchd editing), and a decent battery for less than $800. Is this possible? also I would like something with switchable graphics in order to get 4+ hours battery?