I am at Tradestation, and it's not just about experience. It also has to do with your financial situation, as in liquid net worth. Even though it isn't all in your account there, they require you to provide the info to gain approval.
I have level 4 and trade spreads mainly, the 4 alsos allows cash covered put writes. Level 5 is naked calls, which I have no interest in anyway. On a large co. with low probability for a takeover this wouldn't be much of a problem. However, imagine if you had sold some naked calls on Zipcar even 50% OTM, Bango you take a hit.
I also have an account at Trademonster for Options trading, they have a nice platform, if you're trading multiple contracts or multi leg spreads, the commissions are better.
Give them a check as there wasn't the similiar requirment as at Tradestation if I recall correctly. Minimum for an option account is 5K last I knew.