Spend last night playing with my new Epson V500 and achieved much better results with next settings:
-2400 DPIs. A good size to print and a lot more sharpen than higher resolutions. Acording to some users, higher resolutions stretch scans lens to its limits providing bad results.
-Using silverfast software. More and better controls of scanning settings.(this one is a must).
-Multiexposure on (silverfast feature). Much better colors. More vivid.
-Postproduction. Just some levels and sharpen adjust to match original slide.
I'm not in my computer right now, but maybe tomorrow I'll post one image here te see my results.