Yup, Corsair is pretty good.
If you want XMS that bad, and are from Quebec (which I assume according to the MicroBytes link you provided) may I advise you to check out ShopLCI
and have a look at their Price List in PDF format. They have decent prices, XMS memory and some locations around Montreal and in Quebec City too.
Only gripe is their somewhat poor customer service. But if you know what you want and are willing to wait for them to actually order your stuff if it isn't in stock, it's an OK store I guess.