This is my first post in Ultimate Metal so bear with me if this is answered somewhere else 
I'm looking to upgrade the quality of my recordings, and as the pre amps on the m-audio fast track pro i have been told are of a poor quality.
What exactly would upgrading to outboard preamps do to my signal path? Explain the added goodness if possible
So far i've got 3 different outboard pre amps in my sight and i wanted to get the general consensus on their quality or any alternatives
http://www.presonus.com/products/Detail.aspx?ProductId=15 Eureak Channel Strip
http://www.presonus.com/products/Detail.aspx?ProductId=11 Bluetube Dp
http://www.gearslutz.com/board/low-end-theory/352281-new-neve-clone.html GAP Pre73
Also, would getting a beta 57 over an SM57 yield much of a difference?
**sample of current tone***
http://soundcloud.com/sherdanimal/tone-test-no-bass-guitar
Forgive the faults (cymbals overbearing high end and washyness, wierd automation in 2nd section of guitar volume from over compression and obvious lack of bass guitar, left lead for my interface at school so couldnt track bass at home over public holiday)
Cheers Guys
Natty J.

I'm looking to upgrade the quality of my recordings, and as the pre amps on the m-audio fast track pro i have been told are of a poor quality.
What exactly would upgrading to outboard preamps do to my signal path? Explain the added goodness if possible

So far i've got 3 different outboard pre amps in my sight and i wanted to get the general consensus on their quality or any alternatives

http://www.presonus.com/products/Detail.aspx?ProductId=15 Eureak Channel Strip
http://www.presonus.com/products/Detail.aspx?ProductId=11 Bluetube Dp
http://www.gearslutz.com/board/low-end-theory/352281-new-neve-clone.html GAP Pre73
Also, would getting a beta 57 over an SM57 yield much of a difference?
**sample of current tone***
http://soundcloud.com/sherdanimal/tone-test-no-bass-guitar
Forgive the faults (cymbals overbearing high end and washyness, wierd automation in 2nd section of guitar volume from over compression and obvious lack of bass guitar, left lead for my interface at school so couldnt track bass at home over public holiday)
Cheers Guys

Natty J.