THE TASK of picking the right gift?something cool yet not too costly?for wired family members can drive you nuts. But any of the selections in our Can?t Miss collection of holiday software is guaranteed to delight the recipient and raise your standing as a suave shopper. You Don?t Know Jack TV (Berkeley Systems, for PC and Mac, $30) The third themed (following sports and movie editions) installment of the pop-culture CD-ROM quiz game. Encarta Encyclopedia 98 (Microsoft, for PC, $54.95; deluxe edition, for PC and Mac, $79.95) The definitive encyclopedia for students features Web links, multimedia presentations, and in-depth entries on everything from aardvark to zygote. Crash Bandicot 2 (Sony, for PlayStation, $39.95) Dr. Cortex?s nemesis is back for more animated mayhem in this much-improved sequel. Jedi Knight: Dark Forces II (LucasArts, for PC, $49.95) Cross lightsabers with bad guys in this Quake-style game set in the Star Wars universe.