Switching Stores: How can I switch back to US from Turkey?

I have recently switched from a US account to the newly opened Turkey account. Its is really quite insufficeint. I'd like to switch back. Problem is, I have purchased the iTunes Match service in the mean time; which is a 1-year service. Now, iTunes tells me I can't switch to anotehr store without canceling the iTunes Match seervice. But this is 1-year away. Wht can I do?

Thnx a lot for any help...