[pentagram15]

I have Magnum V4 drivers in SR325 (old one) cans. I am looking for a headphone amp for them. I generally listen rock and metal music and my budget is $900.

What do you advice for these headphones?

They don't have the same sound color with Grados and because of this, it is very hard to choise one. I also tried Pathos Aurium (with Naim CD 5) and it doesn't match good with Magnum V4. (Soundstage is more narrow, sound is a little bir dark and the instruments aren't real enough.)

 

[fabio-fi]

Look into the Soloist (either full sized or SL version) seems to have the qualities to match your Grado's and your music style. It's fast sounding, accurate and neutral. 
 
Very recommended to demo once you are in a headphone shop.