If you can live with the Audioengines for the the time being why not wait "a few months" and combine the $175 andthe $500 and get yourself a new set of Mordaunts...or better.

...with roadster.

save up for something better and take four steps up instead of one. 

the other reason to hold on to your A5's a little longer is that it provides a frame of reference for the changes you'll experience from your source equipment. hear how the Nova improves things with the speakers you lived with for two years. i've made the mistake of upgrading too many pieces all at the same time. it makes it harder to evaluate whats making an improvement and what's making a BIG improvement (and sometimes what's harming the sound) doing one upgrade at a time makes it easier to understand how you arrived to your system sound.