The set I've been pining for is the Motorized Bulldozer[1]. My hope is that Lego will reissue it one day. That said, as a Lego fan, I've started getting pretty annoyed at the company for their "special parts" and limited edition print runs. Talk about creating artificial scarcity! I look forward to the day we can get a quality 3D printed construction system - with opensourced designs of course!

[1] http://www.toysperiod.com/lego-set-reference/technic/model/c...