I have both both Audioengine 5's, and 2's, and am super happy with them.  The 5's suffice without the need for a subwoofer (though add it if you like, it will be an enhancement).  I have the 2's set up with a sub (although not the Audioengine one, I happened to have an Earthquake Supernova MkIV available), and it is a genuinely great sounding stereo system.  And feeding my computer USB output through an external DAC/headphone amp helps too.

The Swans look good but I aint heard em.

You get a home audition and can return them within 30 days for a purchase price refund if you don't want them.