Looking to upgrade center and fronts, need help please

[Lt. Aldo Raine]

I am looking to upgrade my center and my fronts, i just bought a new receiver sony 720, i dont know a price range(not too expensive tho ofcourse) because i havent bought seperate speakers before im ugrading for a HTIB, and now that i have a new receiver i want my home theatre to really start coming together, i live in toronto so if anybody who lives here would be a plus , if you know anywhere to buy good speakers for a goodprice (under retail would be nice) then please help, i dont have a credit card right now so cant talk advantage of web sales but might get one soon, dont really know what brand to go for but i heard polks klipsch are good, and is it ok too buy a center channel first and then fronts later and vise versa, i was gona get a center first cuz i really want the dialouge to come through, any help would be a appreciated, dunno if i left anything out so be free to ask questions,
thanxs guys, iceman

i tried searching the forum but too much came up and nothing i wanted lol