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How does impedance effect headphones?

I've decided that I want to buy Beyerdynamic DT 990 Pro Headphones but they come in three different impedances (and unimportant aesthetic variations).  It comes in 32 ohms ($349), 250 ohms ($260), and 600 ohms ($369).  I've already looked on the internet and it basically said that impedance does not effect sound quality but the MSRP on these differ up to 100+ dollars between models, what gives?  I will mostly be driving these headphones off a laptop and occasionally an ipod.

http://north-america.beyerdynamic.com/shop/hah/headphones-and-headsets/at-home/music-pleasure/dt-990.html

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Re-design7 years ago
If you're using them with an amp that is used to seeing an 8 ohm speaker the you should not go higher that the 32 ohm phones.

The 250 and 600 should be used with headphone amps that are meant to be looking at a higher imp. load.

THe company builds headphone amps with output imp. of 300-600 ohms on the ones that I saw.