Forget granny and junior. For the ultimate geek, we suggest you hunt down an Eternia playset. In the 1980s, this epic "He-Man" battleground was the Barbie Dream House for boys and girls that weren't afraid to punch boys. We had one as as a kid. (Don't get jealous now. The Slug was an only child.) The king of toys featured three towers (Eternia, Castle Grayskull, Snake Mountain) and an interconnected monorail system for your action figures. Dude, they don't make toys like this anymore. Obviously, you can't get this bad boy in stores, but a mint condition Eternia recently sold on eBay for $325. Assembly not included.