For gate racing, consider full race boards by Donek, Coiler, Prior, Madd, Volkl, Virus, Pogo, Nidecker, Kessler, or even older/used/former race lines by Oxygen, F2, or Burton. Kesslers, in particular I believe, are dominating the podium. Keep in mind, some of the qualities that make a great race board don't neccesarily make it a great freecarving board and vice versa. In general, the shorter boards with tighter sidecut radii are used for SL, while the longer boards with longer sidecut radii are used for GS or SGS. Some racers are using various suspension kits, like Hangl's, on their boards as well. Bomber's and Catek's are probably the two most popular hard boot binding options, and certainly the beefiest. You'll find hard boots by UPZ, Head, Deeluxe, and some random others. Most of the race board companies mentioned make stiff soft boot setups geared specifically towards Boardercross as well.
Look online for these manufacturers, though. Alpine rides represent a niche market and are almost never found in stores. As such, virtually all alpine gear purchases are online.