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Which one is more suitable for  beyerdynamic dt770 pro 250 ohm , As I know m-audio has a better rec (line in) also I think it has a better amp unit  too but creative has 96/24 output I  think m-audio is a better choice.     Thanks in advance

http://www.amazon.com/Audio-Technica-ATH-ESW9-ATH-ESW9A-Portable-Headphone/dp/B002FTIDQC/ref=sr_1_1?s=electronics&ie=UTF8&qid=1313828484&sr=1-1

As I can see a DIY LOD  needs a cable,dock connector ,3.5mm jack,solder  I was searching the net for the best pieces that will make the best DIY possible what I have reached till now:   jack: Via blue T6s PHONO PLUGS STEREO 3.5 MM...

I Wonder won't solder's decrease connection quality or increase the cables resistance,or is there a special type for high-end connections ?! 

whats the deference between tube amp and solid state amp where to use each of these amp's? does it depends to the impedance , power output,..., of the headphone or what?! Is it good to have both type or....

witch one is better akg 450 or 151dj