City select baby jogger & capsule compatible?

I'll be getting a 2014 city select baby jogger and ive been doing some googling about compatible capsules, but a little confused on which one to get. Apparently the maxi cosi, peg perego, chicco and the safe and sound unity are the only ones in australia that are compatible with this pram, but some people have said that not all of these capsules click in properly to the pram and they just use the safey strap. Does anyone have this pram in australia that could help me out? I'm thinking about getting the maxi cosi one but it is a little pricy.

Thankyou

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