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Baz I don't think you will achive your stated goal, IMO the 5DII simply isn't sensitive enough to produce short exposures of the night sky without a significant tradeoff between noise and trailing.
As Humayan points out, long tracked exposures will produce the results you're after, rather than spend cubic dollars on wide and fast you may be better off investing in some lightweight and portable tracking equipment.
That said if you still want fast and wide, as Gavin suggests, dig deep and go for the Canon EF14mm F2.8L, just don't let the minister for household affairs know how much it cost.
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