Oooh, nice choice on the colours!
We have a brown base and beige top, but I've never been 100% on it. It did however match our living room very well! And it did spend a lot of time in the living room as that was what ds slept in downstairs, as it had the proper mattress etc, so was about as good as a Moses basket I think.
I quite like the v dark grey base, although every time my mum sees one with a grey base and beige top she's all 'Oooh, that doesn't look nearly as nice as the brown base', but I think possibly the grey base looks nicer. I might have a sneaky trip along to our buggy shop and see if there's anything i like better, although I suspect DH might be hard to convince on this one unless there's something wrong with ours when we get them down!
That makes a lot of sense about the mw appts Scream - will be interesting to hear how you get on at your 17 weeker - see if you get anything extra!