Been listening to the CX21 a lot lately.  Excellent for metal.  Love the balanced signature with solid, tight low-end.  

I can't comment on the AT's.  I can highly recommend the S4's though.  I have been using them since 2009, and they remain my favorite earphones.  I have used Klipsch X5 (a major step above the S4, but discontinued now, and an armature design, so very different sound), Ultimate Ears 700, Super-Fi...

Can't help you much with the Shure Olive's but I know I have used Comply tips on the S4's, and you can easily look up which ones you need on the Comply website, search by the drop down menu, click on Klipsch, if I remember correctly.

Yes, the Sennheiser PX100-ii should take care of that for you.  Way more bass than the 238, too much for me in fact, and they fit much more snugly on the ears.

I have been listening to Amon Amarth's new one Surtur Rising nonstop lately :)

I have been looking at the Beyerdynamic DT 235s, any other suggestions would be appreciated.

This may have been asked before.  What I am looking for is suggestions on headphones in this price range that are capable of faithfully reproducing the detail and technicality of modern metal and its various subgenres.  In other words, very fast music.  Something with exceptionally tight bass...

I've been really considering the 16gb Nano 6G, but I am worried about storage capacity.  How much capacity do you get in reality?  Usually its something like 15gb.  In iTunes, I have a total of just under 18gb, and some of it I wouldn't even put on the Nano.  Wondering if I just rerip some of...

No worries, as the UE700 are excellent in my opinion, assuming you are not a bass fiend. 

I had the 700's last year, and when I sold them off for certain reasons, I was dying to get them back again.  Now, they come with new packaging and they actually come with different silicone tips.  The packaging is specifically Logitech packaging now, same packaging as the UE500 and 350's...

I am seeing various models of the Xonar cards, which is the recommended one here?  I see a DX, D2, STX, etc. 

Thanks, one more question, how difficult is it changing sound cards?  I have never upgrade a desktop before, so I have little experience opening the thing up and upgrading stuff.  I will look into the Asus sound cards, didn't even realize they were a player in upgrading sound cards.  I always...

Since nobody actually answered my original question, perhaps I should assume that integrated 7.1 surround audio is no good and its worth investing in a sound card? 

So most desktops ship with 7.1 integrated audio, but some manufacturers like Dell, HP, and Velocity Micro offer the ability to upgrade to a Creative Sound Blaster X-Fi Xtreme Audio card ... is it worth the upgrade for headphones and my 2.1 speaker system (H/K Soundsticks)?  

Looks like the Image One are priced to compete with the Bose Around Ear 2, also around $150.  Anybody have a chance to compare the Klipsch and Bose?