The 7G may look like a standard, featureless keyboard, but it has a few surprises in store. The first are the connectors–rather than just USB there are USB, PS/2, headphone, and microphone connectors. The PS/2 is what actually connects the keyboard for typing input (a PS/2-USB converter is included), while the USB is used there for the two-port USB hub behind the Escape key. There are also two sounds jacks (microphone and audio) which simply relay the input on your computer to the rear of your keyboard, making them easier to reach. The cord is coated in a nylon-like material which is a nice touch, but it’s heavy and not particularly flexible so it can be a pain to work with, especially if you have something right up against the back of your keyboard. The good news is that it is quite long so you probably won’t be wishing you had bought a wireless keyboard as you try to reach the back of your computer. The use of PS/2 allows for more keys to be pressed at once than you could with a typical USB setup, in fact there is no limit to how many keys are recognized.

Elixir or arctosa?

-don't really need the macro functions
-prefer not to be a laptop type keyboard
-additional usb port could be useful

I would suggest buying a separate PS/2 keyboard for o2jam, since usb isn't ideal for anti-ghosting. Best keyboard to use for o2jam IMO is Logitech Internet Keyboard, not sure if they still produce it though, used this for all the competitions during the heydays of o2jam. Either that or Samsung Trution. Which is out of production already.

Samsung keyboard?!? Better dun try...