Edman, no need for a headphone jack with the K1000's. They come stock with bare wires so they can be hooked up to speaker teminals. You can have an adapter cable made to convert them to a standard 1/4" headphone plug if you want to use them with head amps.
The place to read about K1000 amping options is at www.head-fi.org where there are many threads in the archives that are right on topic. The Sonic T Impact amp is something like $39, and is fully digital. Cheap looking, but excellent sounding. You can do better, but at a price. The Audio Valve RKV tube amp is wonderful with the K1000's, and goes for about $700 in the used market (without the companion "Impedanzer" which you wouldn't need for the K1000's but would need for lower impedance headphones). The RKV is definitely a "looker" and would fit nicely in an office environment (it comes in black with gold trim or in an silver look).
The place to read about K1000 amping options is at www.head-fi.org where there are many threads in the archives that are right on topic. The Sonic T Impact amp is something like $39, and is fully digital. Cheap looking, but excellent sounding. You can do better, but at a price. The Audio Valve RKV tube amp is wonderful with the K1000's, and goes for about $700 in the used market (without the companion "Impedanzer" which you wouldn't need for the K1000's but would need for lower impedance headphones). The RKV is definitely a "looker" and would fit nicely in an office environment (it comes in black with gold trim or in an silver look).