DOB or APO ?
Definitely DOB. Galaxies are not really in reach of refractors at the ~ $3500 level, especially if that budget has to cater for a mount as well.
To stretch your $$$$ further, I suggest buying a used one rather than new
BUT before opening your wallet at all, I suggest you get along to an astro gathering in your area and try a few on for size.....
Clickie here:
http://www.astroanarchy.com.au/teles...oToDob_14.html