willitblend said:

With a $600 budget would you think it would be better to get a $200 pair of cans and a $400 amp or $300 cans and a $300 amp to for iPod use?
I would think more expensive amp right?

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depend on your cans

Say the Sennheiser HD600+$300 amp+iPod or Sennheiser HD598+$400 amp+iPod

Personally I'd spend the most on the transducers (cans).  They'll make the most difference .....

brooko said:

  Personally I'd spend the most on the transducers (cans).  They'll make the most difference .....

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I'd go this way also.

There's one more thing to consider.  If you already have the iPod and it has a 30-pin (old style) output, you can get a line out dock (LOD) to bypass the internal headphone amp so that the volume is only changed on the external amp. The audio will be higher quality, too.  FiiO makes inexpensive LODs like the L3 and L9.  If you are using an iPod that has the new Lightning connector, this is only digital, and you will likely use the headphone out which may lower quality somewhat.  
 
If I was capped at $600 and considering only inside use at a desk, for example, I would consider an orthodynamic planar headphone like the Mr. Speakers Mad Dog (closed) or the HiFiMan HE-400 or HE-4 (both open), and pair with an amp.  All three benefit from having an amp (and full disclosure, I have heard the Mad Dog and can vouch for it, although I own the untuned Fostex T50RP that Dan starts with), and the money spent on an amp will be useful.  Note that there are a lot of headphones at the $300 price point that are more lifestyle headphones than high-quality-sounding headphones, but that tends to change as you go up the food chain to $500/$600 and up.  

Nah I have the 15 pin port.