Actually, my prints from Aperture are pretty good. the colour could be improved though via custom profiles.
When you print from Aperture, it's important to turn off the Colour Management in the Print Driver; eg, the Epson print driver. You then choose the suitable profile from the Profile popup in Aperture's own Print dialog.
I have a pretty good idea how to produce the profile charts. I'll give it a try and see what happens.
(Mac OS X 10.4.9, iMac Core Duo, Epson 3850)