After talking with many from Toronto and Vancouver, Actually living in Calgary is 20-30% more expensive compared to Toronto and Vancouver ( Rent in Vancouver is still cheaper than Calgary even though buying is more expensive).
Sorry for not keying in Chinese 'cause I am in office now.
Actually you can also find good deal with VISTA, then if you don't feel like VISTA, then you can reinstall XP system instead easily. The reason for this is what have on market are brand name computers so you can easily find drivers for most hard ware from website.
With the budget of $600 I think probably you can get a good deal laptop.( I never recommend anybody to buy expensive computor 'cause it never hold value).
For this price if you find it slow after years, you can upgrde to larger RAM when you are in China. Of course this idea is definately not for game players.