In reply to Oujmik: Ok, bearing in mind what's coming in and that you have your own speakers already, the obvious alternative to the otherwise well-regarded for the modest price amps you've already tried and had problems with would be a lateral shift: don't get a separate amp, get a mini-system that comes without speakers.
Your local branch of Richer Sounds or Superfi would be good places to start, and giving the staff there a problem to solve should get them more engaged than going in with a particular product in mind. Plus that way you can get a refund if needed.
T.
Though if it were me, I'd get a secondhand Pioneer A-400. Great amplifier, that.