I think i have just been recommended Ubuntu but I suppose this is not a must-have.
So will i need to buy a PC for the online computer too?
Thing is I have been a mac user for years and iI can't even find my way around Windows. lol
There will be mac binaries soon. We just recently figured out how to package it. If you want to do it right now, though, you would have to follow
Red Emerald's brew formula (which involves opening a terminal and typing a few commands). Obviously, the package would be better, but it's not ready yet.
You can use any OS online and any OS offline that runs Armory. The data moving between them is platform-independent.
For the system without an OS, I recommend installing Ubuntu 10.04-32bit and using the offline bundle (which can be found
here). The reason for that is that if you want the offline computer to never touch the internet then you need to have a few dependencies installed in Linux for Armory to work right (that's what the offline bundle has).
If there's no DVD drive, you can make a bootable USB key installer. You could use your 16 GB key once, wipe it just to get the OS installed, then go back to using it for other things. Download
Ubuntu 10.04-32bit CD image (the "PC (Intel x86)" link at the top). If making the USB installer in Linux, you can find the "Startup Disk Creator" application (google for it for your particular linux version), if you have access to a windows machine I recommend
unetbootin for making the USB. If mac... I don't recommend doing that in Mac, as I just googled it and it looks like it can be complicated (but
here's a link so you can try).
The nice thing about the offline bundle is: once you have Linux installed and you copy the offline bundle onto that system, you just run the install script and Armory works. That's it!