Especially based on Debian/Ubuntu.For example with Grsecurity and Snort. TOR Anonimity is not necessary, but must be anti-hack.
I see Whonix and Subgraph OS, but Whonix is Tor oriented and Subgraph is only Alpha and worse that I can't download torrent (site is hacked?)

Hate to be that guy, but there is no such thing as anti hack or anti crack. If "they" know how, and have the time and resources available they can and will get in. Your job is to make it not worth their time. Physical security is best, secure the house/room/office from intrusion, secure the boot with a password, secure grub or lilo with a password, have strong passwords for your user(s), strong password for root, use a router even for ethernet, use a firewall as another wall to jump over, backup your computer, upgrade patches when available....and most importantly, have smart online behavior, that keyboard and you the user are a major security hole.

Best security, never access the internet.

Read up on how to secure Linux, lots of good things on LQ about it and the net. Oh, don't go clicking on random links either, and absolutely stay away from porn sites.... Hope that helps...

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Agreed, no such thing as a perfectly secure system, but it sounds like you may want to check out Qubes OS as it may be what you are looking for. Or not, but worth a look.

On Archlinux you can install hardened kernels, I suppose there are some distributions that ship them by default with some other hardening possibly.
I would probably choose a distribution that has Selinux on by default as a starter (Centos, Fedora). But i kind of never shopped around with this idea so i have no clue if there's a distribution that has all possible aspects hardened.

Qubes OS is great but you will need very specific hardware to get most of it and it still has no 3D acceleration.

The only guys who are really security oriented are OpenBSD but that's not Linux and they are not very friendly towards newbies...

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Tails. Stick it on an USB stick and run it from there.