I'm going to buy a new laptop within the next few days. I only need a low spec so I expect to pay about £500 -£600. However I'm also going to America at the end of October so I'd like to take it with me. Do I just need an adaptor to charge it up over there, I assume it will take longer, or will I need a different transformer? Also would I be better waiting and buying one from America, I think they're cheaper over there but does that include duties/taxes?