JimL11
1000+ Head-Fier
I've listened to my Koss headset on JimL's amps; some relatively inexpensive Stax ones that he modded, and his BHSE. The Koss sounds significantly better on the BHSE , and slightly better on the lesser amps. Lesser in this context means ~$1000. The 950 at $500 or less is a steal, and doesn't really require an upgraded amp unless you area really picky and can hear a nat's fart. Of course, "require" is a very relative terms in this "hobby".
Actually he listened to two, an SRM-727 with global feedback mod, which costs >$1000 due to the basic cost of the 727 (the mod costs $1 in resistors plus a few minutes desoldering and soldering time), and an SRM-T1 with constant current load mod and replacement electrolytic caps, which costs considerably less than $1000 (basically cost of T1 plus <$100 parts, plus a few hours soldering time). Of the two, I think the T1 sounds better - I sold the modded 727.