I used Send My Bag after someone on this forum recommended them on a previous post of mine. UPS were the courier that then collected them and then delivered them about a week and a half later. Price wise I found them better than going direct through the other couriers but I do know of other people who have gone direct through the couriers and got a better price so it depends really.
Process is pretty easy - Quote, Order, Complete customs paperwork, Package items, Courier collects and then Courier delivers but the website is relatively easy to understand and follow these steps