Habitrail Ovo

How many mice can be kept in the Habitrail OVO loft?

I would probably getting that cage, I want to get 3 females, do I need something bigger? Any links to good cages?
P.S. Here it is: http://www.amazon.com/Habitrail-OVO-Loft-Cage/dp/B001B5AYW2/ref=sr_1_2?ie=UTF8&s=home-garden&qid=1265422474&sr=8-2

I wouldnt house more than 2 mice in there.

something like this would be better.

http://www.petsmart.com/product/index.jsp?productId=2752727

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