I've already got some of it. I have Blu-ray, PVR, the PS3, and the XBox 360. I have wall-to-walldvds and more videogames than I know what to do with. A bigger flatscreen would be nice, say in the 60" range. And a Lay-Z Boy sofa with speakers and subwoofer built into the seats.
Mostly, I would want a pool table and air hockey table. My friends and I play an insane amount of that.

i'd have all the crap batman and superman put in their respective fortresses, with TVs, sofas, hoverchairs, and a portal through which i can go anywhere. plus, robotic slaves o do whatever for me.

Hammerknight said:

That all would be real cool. But you forgot the frig in the lazy-boy and full maid service.

the maid service would be included in the robot-slave thing. and when i said "hover-chair", i meant "hover-lazy-boy".

Twice now, I have assembled my mancave and had it overrun by household changes. It consists of a stereo, computer, and a desk/bench of my own design composited of two desks and an entertainment center. Desk, cp, stereo and filing cabinet are one piece with a clamping arm attached, suitable for holding a clipboard, assembly manual, embroidery hoop or notebook--that's 7' long. The bench part has a 6' x 3' work surface with most of an entertainment center 5' h x 5' w mounted above it. The shelves are stuffed with tools, materials, and trays which hold individual projects in various stages. One rolling chair completes the whole thing. I've had less than 2 months total use of it, but I've worked on it in metal, wood, wax, stone--and I painted, drew, sewed as well. And on the computer, I wrote and used a form of AutoCad. I designed it for ease and speed of multitasking and switching media.