Active speakers to replace GMA Europas

In the process of selling my equipment to finish paying off for graduate school but still would like to get quality sound on a budget. Currently this is my setup.

GMA Europa
Modded Bolder Squeezebox 2
Onix Melody SP3 Integrated tube amp

Let me first say that I love my equipment and love the sound I get from the GMA Europas. Besides the monetary issues I have also been thinking of giving up my precious setup to achieve a more minimalistic setup due to space constraints and future plans on having kids.

What I really want to do now is simply have a pair of active speakers going to airport express to my mac. Eventually down the line I would get a dac. First things first though, are there any comparable speakers for around 600 new/used that can compete with GMA Europas? I been hearing a lot of the Audioengine 5 and NHT M00 but cannot see them being in the same league as the Europas?

I need some suggestions everyone even in it goes above 600.

John