Hey, I made it! This is what I found:

To avoid pixelation:
a) No feathering edges
b) Transparency type needs to be Mix
c) No drop shadows

(maybe feathering/shadows are rendered as images?)

To avoid object mislocation:
a) Reduce transparent and layered objects as possible
b) Avoid Clipview with complex objects inside

Save the file as SVG --I got a 300kb file--, "Place" it in an Illustrator document and save it --got a 500kb file if artwork is scaled, 1.5MB file if I put the artwork full size.

I also tried PDF/X export, very cute output as well but file size is bigger, 7.6MB scaled...

The colors seems to be somehow different between SVG and PDF output; SVG shows them more vibrant while in the PDF they are a bit pale.

Thank you all guys!!!

Aram