[dhc0329]

All I need is the followings for 2.1 speaker set up with sub woofer connecting to my PC. I will have stereo out from my op-amps upgraded Zxr soundcard to
AMP. A good high end small Amp would be good if you can recommend one.
 
Two Speaker Out (L/R)
Stereo In Jack
Sub Out Jack

 

[Bmullock]

Both Cayin and Aune produce excellent amps, well engineered, great sound and reasonably priced.

 

[ProtegeManiac]

 
Two Speaker Out (L/R)
Stereo In Jack
Sub Out Jack

 
I think only the NuForce Icon (whatever version is current) has all those. Many don't have the subout. Note though the sub output on these are 3.5mm, so you need a mono 3.5mm to RCA cable (check the site/packaging as it might come with such a cable).