Integrated amp under $ 500.

You didn't mention whether tubes or SS but in the tube category the Jolida 102B with the very sweet 6BQ5 (EL 84) tubes is a great integrated providing ~ 20 watts per channel. Also in that same category the Sophia Baby is great if you have fairly effecient speakers.

There is a Acurus DIA 100 MKII on the site now for $425, better than the original one and 2 outputs.
some info
http://www.klipsch.com/products/discontinued/details/dia-100-mk-ii.aspx

Vish: not sure what you meant by your comment "I am keeping my current amps". Are you no longer looking? If still looking, I would also highly recommend the Acurus DIA100. It still drives my old B&W matrix 803s2's, and I love this integrated! Mine is not for sale, lol!

I still think the Onkyo A-9555 is one of the best integrated amps in this price catagory.

I recommend Rotel RA-1062. Retail for $700, but you should be able to get a used one within your budget.

I have one, and it sounds great. I used it to drive my ProAc monitors.