I can't believe this is still for sale. Maybe I should add some more pictures or something...
I think your price is more than fine. If you can afford to do it, I would just sit tight. Don't give it away.
Times are just really tough right now. If you are priced fairly, the right buyer will eventually come along. Just a matter of timing. Maybe the guy that really wants your item hasn't entered the market yet? Maybe he will do so next week...or next month.
Beginning of the year I was selling 2 pair of floorstanders. I got all kinds of ridiculous offers. I knew what I had and I thought I was priced right. So I did not panic. It took four months but I stayed firm and eventually got my price on both pair of speakers.
If you have the luxury of waiting I would do so.
Just last week I got an email from a buyer inquiring about my old listing for this exact amp over on AudioXsell. I'd give you his email but I chucked it. Maybe he doesn't visit this circle. Post it over there (it is free), maybe he will see it. FYI, my ad was over two years old and my price was quite a bit higher.
Good luck!