Whether you rent or own, home sweet home takes the biggest bite out of Bay Area paychecks—so of course we want our nests to feel like castles. That’s why integrated music libraries, juiced-up toys by Mr. Jobs, and couchfront cinemas are appearing in condos, mansions, and Victorians all over the Bay Area. Here are the experts who do custom tech systems best.

Working while surrounded by motherboards, gaming equipment, and boxed webcams in his unassuming Outer Sunset storefront, David Wong does it all. His passion for hardware matches his affinity for software, and he’s comfortable retrieving data from your Dell, fixing a glitch on your Mac, or building a custom computer (or server) from scratch. Wong’s Cosmic Computer has patrons who belie his low profile, like folks at LucasArts and DreamWorks, the San Francisco city government, and the FBI. 1133 Taraval St., 415-759-9506, cosmicpc.net

There’s nothing like seeing a movie the way it’s supposed to be seen—on a silver screen—in your own home via Audio Vision SF’s 110-inch, diagonal, 2:35 aspect ratio projection theater, which the company will install in either a screening room or a living room. “What we get are hobbyists, enthusiasts, and people who want to freak out their friends,” says co-owner Randy Johnson. 1603 Pine St., 415-614-1118, audiovisionsf.com

As soon as you and your date arrive home from dinner, press “Soirée” and watch the LED lighting dim and the counter-turned-bar light up, as lovely classical melodies fill the air. Techlinea doesn’t just help you create the right mood, though: The com­pany specializes in lighting and James Bond–worthy security and surveillance, including reinforced concrete walls, steel doors, and independent ventilation and communication systems. Going out? Press “Exit” to power down your ambience and power up your protection. No worries if you forget: You can always send the sys­tems a message from your BlackBerry. 577 Howard St., 415-836-9140, techlinea.com

Is your Mac feeling grumpy? Make it happy again with “iWhiz” Joe Heavey of Jupiter Consulting. In his 15 years on the job, this Mac-only specialist has made house calls to rescue psychiatrists, authors, designers, architects, a Nobel Prize–winning scientist, a nanotech consulting firm, and more. Starting at $120 per hour, he’s not cheap, but he gets it done. 415-310-1714, sfjupiter.com