You can get some the like this
Fosi Audio intergrated. Their products measure pretty for their "budget" category.
Another option would be powered speakers and a PreAml/DAC. In your price range would be speakers like these
Kali Audio and this
Digital PreAmp/DAC and those get you in your $600 range. Both of those review well.
We reviewed the Kali Audio LP-8 powered studio monitor loudspeakers to determine if pro-audio equipment can be used with excellence in home audio applications.
www.audioholics.com
Kali Audio LP-8v2 2-Way Studio Monitor Review
www.erinsaudiocorner.com
This is a review and detailed measurements of the Topping EX5 produced exclusively for Shenzhenaudio. The EX5 is slated to cost US $349.99 which it is released. The sample I have is from production run but is awaiting the manual for formal shipments. It was sent to me by Shenzhenaudio. The...
www.audiosciencereview.com