[KG Jag]

Haven't heard it, so I can't tell you.  It seems to review well.

 

[Rhamnetin]

  What about the HE 400i? Does it have some of the midrange problems it's precursor had, or have they fixed those issues? I just like to get every angle of the argument I can find. Sorry for the gazillions of questions!

 
Look for HE-400 vs HE-400i and HE-400i vs HE-500 comparisons here on Head-fi.  I never heard the HE-400i but everyone says it has very little in common with the HE-400, and is much much closer to the HE-500.  Both are the same price and the HE-500 is said to be more open-sounding and perhaps more detailed, so I'd go for the HE-500 unless the weight is a problem.  Auditioning both would be a huge plus.

 

[Za Warudo]

If you don't mind buying used you can sometimes find the HE500 for under $400 in the classified forums.

 

[Pirakaphile]

   
Look for HE-400 vs HE-400i and HE-400i vs HE-500 comparisons here on Head-fi.  I never heard the HE-400i but everyone says it has very little in common with the HE-400, and is much much closer to the HE-500.  Both are the same price and the HE-500 is said to be more open-sounding and perhaps more detailed, so I'd go for the HE-500 unless the weight is a problem.  Auditioning both would be a huge plus.

Seems like the 500 has a little more respectability and such, so I think I'll be going with it. Also, another thing is, the hifimans all look absolutely boring. The DT990 Pros look like something right out of a robot, and the grados, as simple as they are, look fantastic to me. 
 
 

  If you don't mind buying used you can sometimes find the HE500 for under $400 in the classified forums.

I'll keep my eyes peeled and shucked 

 

[KG Jag]

You might do even better following the Deals Discussion thread.