Hi L0dgik83 welcome to the LinuxQuestions forums. I have been asking questions here for a while and the community seems to be nice when it comes to help other members.
As you might have already noticed, English is not my primary lenguage there fore I had a bit of trouble reading your post I would suggest to try to spell out the words as best as you can. That will prompt quicker responses perhaps.
So for what I understand you want some suggestions on Linux Base OS for your computer?
Perhaps what you can do is download and install a distro that is light weight so you can use the power and resources of your computer to do actual calculations instead of moving heavy graphic
I would probably suggest Xubuntu for a friendly distro here is their links http://xubuntu.org/
and Lubuntu here is their link http://lubuntu.net/
Download the ISO image and burn it to a CD Each file should fit just fine in a 700 MB CD
Also you can do a minimal installation of Debian and built up the OS whith apps that you like here is their link http://www.debian.org/
Good luck to you