iPod 3g iPod replacement battery websites?

[Nuks]

Does anyone know whether this is a reliable site for replacement batteries?
http://www.ipodjuice.com/3rd-generation-ipod-battery-replacement-products.htm

I'm thinking of getting the 850 mAh battery for 30 bucks. Should I upgrade to the 1100 model? This is just to hold me over until the 32gig ipod touch comes down in price.

If this isn't a great site for buying from, can anyone recommend a company that will ship to Canada?

Thanks.