Though not a true cobra (as in Naja), coral or shield nosed cobras (Aspidelaps sp.) have often been recommended as starter elapids...their venom is moderately toxic, and fatalities are rare (though a possibility), but you must remember: THERE IS NO ANTIVENOM! This means if you are bitten, the bite will have to be exclusively managed without AV. I don't think that SAIMR polyvalent does much at all to counter the venom from this species. The plus side is they are small, chubby little sausages of snakes, and fairly easy to handle for an elapid.
Another possiblity is Naja pallida, which some have recommended as well. A very decent sized snake (3-4 feet average), they are spitters, so that is a down point, but it can be noted that on average, spitters are more inclined to spit than bite (not that they won't bite), so this can be either good or bad depending on what you are more comfortable with: a snake that actively goes after you to bite you, or a snake that actively sprays it's venom all over you. Keep in mind exposure to venom can lead to an allergy developing, and if you are bitten by that snake in the future, anaphylaxis can kill you within minutes. You will want to be well versed in what anaphylactic shock is and how to treat it yourself (i.e having an epi-pen in your bite kit) way before you even think of getting a spitter. Actually, before you get a hot period.
Anyway, if you haven't kept hots before, cobras (or elapids in general) are not really the way to go. Unless of course you work dilligently with another elapid keeper for a good amount of time and get familiar with them.
Please keep in mind I am IN NO WAY encouraging you to go out and get a cobra, i was just answering your questions for you 