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@Jon.
Change of heart, I'm going to go for retroshift. Will be ordering in the next few days if anyone want to go in on postage ($15), though ordering in bulk will increase our chances of getting stung for import duty...
gear-calculator.com has led to something of an obsession with comparing gearing. I'm going to run a 12-25t 8 speed cassette with 34-44t chainrings. This should give me the same range (and pretty similar jumps) as a typical 10 speed cross setup: 12-28t with 38-44t chainrings.