Looking for good computer speakers

I have a set of Totem Mites with a small matching Totem subwoofer… using an integrated tube amp. Sounds incredibly good, musical, and punchy. Highly recommended… and looks beautiful. 

KEF makes some 'desktop' - ' Actives ' - LSX:LSX Wireless Music System (kef.com)

Questions:

1. What is your budget.

2. Do you have any size constraints? (i.e., can you use a speaker that is 12" wide and 14" tall?).

3. Are you wanting to use the USB connection on the Mac?  Or do you have an analog output that you can use?

I am using an older model of Emotiva bookshelf type speakers for my iMac computer listening and am very pleased.  I am also using an Nuforce desktop amp along with a Schitt Modi.  Emotiva now has an updated model:  Airmotiv B1+.   Relatively inexpensive.  You might check the Crutchfield web site also to get a more comprehensive idea of what else is available. 

Want to listen to music. I would also like to use the usb connection. I like the idea of powered speakers with the dac built in, easy and all. As far a size goes, this is in a small outside office about 9' by 12'.