Recommendation for Good Quality Desktop Speakers

I am looking for speaker recommendations for near field listening when i'm sitting at my desk. I have a 8 Watt tube headphone amp for power. I currently have NHT (H:12" by W: 71/4 by D: 9") speakers on either side of my 26" screen. I'd like to stay within the current speaker dimensions or smaller. I sit 30" from the screen. This setup is ideal for late night listening. I've considered Harbeth P3 ES2 or something at or under $1,500.00.

Thanks for your thoughts.