your mac warranty isn't affected by which country you bought it from. It is specific to the machine itself so go for it.
Computers always fucked me off but I have only sworn at my mac once and really I was in fact swearing at my own impatience for not reading the instruction leaflet when starting to use it. Needles to say I still ain't read it but they're so intuitive to use. Go for it yorkshirewarcry. My advice is to monitor the mac website shop for refurbished machines until the one you want at a price you want comes up, be patient but it's worth waiting. It took about 3 weeks of looking daily for me but it was worth it. i never knew just how anal you had to be to get a good deal on the things you want 'ont web.