I would like to know if the same connection that has only D-SUB (the classic VGA) using Adapitadores DVI to D-SUB I could use the 2D Surround.
I'm not sure I completely understand your question, it is worded in a confusing way. If you're asking if you can use 3 monitors that don't have DVI connections in surround by using d-sub to DVI adapters, then yes I believe so, as long as all the displays have a common resolution, refresh rate, and sync polarity. I'm not 100% certain, though.
However, if you're asking if you can use a video card with a D-SUB output in and a video card with two DVI outputs, then no, that will not work, because you need two video cards of the same model in SLI to run surround.
"for now I'll use a GTX 470 + secondary VGA one less power"
This will not work for surround.
get my 2 GTX 570.
However, two 570s will work for surround.
I hope that answers your question, I recommend looking at this page for more information:
http://www.nvidia.com/object/3dv-system-requirements-surround-technology.html