Thanks for the info, Foo-Bar. That looks pretty done and dusted now.
Cairo - I'm pretty sure that the existing functionality will be carried forward to the 301, but I don't know for sure, of course.
How important is the HRM for you? If 'very', then I'd definitely wait. If 'not very' then to be honest I might still wait, because I suspect that the 201 will drop sharply in price (as well as a lot of used 201s coming onto Ebay as their owners trade up to the 301).