Do you buy an arranger NOW, or do you wait a year? And you'll be asking the same question in a year's time, too...

Holding off on the iPad, while you wait for a Windows equivalent, with the same ease of use, security and app selection shows a level of restraint I don't see here at SZ too often re. arrangers! I say get what you want NOW, and then, if something demonstrable better, cheaper, more secure and with better apps comes out in a year, get it THEN. (your iPad will have a decent resale value)

That is, unless by then, Apple improve the iPad to at least Windows tablet standards.
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An arranger is just a tool. What matters is what you build with it..!