Don't bother with passive 3D at all unless it's from a 4K set. The passive part works by switching half the columns to one polarisation and the other half to the other. The end result is that your TV no longer has the horizontal resolution it used to. With a 4K TV, you can display a full 1080p image with passive 3D in 1080p. In a passive set, you can't - each eye is only getting half the horizontal resolution.
Anyhow, 3D's a bust. If you REALLY want it, I suggest picking up a super cheap Sony 3D monitor meant to go with their PS3s (most stores are clearancing them out - $99 or under). And the 3D active glasses are super cheap - against, I've seen clearout pricing of $20 per pair. (Side note: they're "universal" ones so they work with Sony, Sharp, LG, Samsung, Panasonic 3DTVs as well - don't pay $100 for the manufacturer's pair...).
Anyhow, 3D's a bust. If you REALLY want it, I suggest picking up a super cheap Sony 3D monitor meant to go with their PS3s (most stores are clearancing them out - $99 or under). And the 3D active glasses are super cheap - against, I've seen clearout pricing of $20 per pair. (Side note: they're "universal" ones so they work with Sony, Sharp, LG, Samsung, Panasonic 3DTVs as well - don't pay $100 for the manufacturer's pair...).