So having a 7-buy-in 'roll might work if you have more money "in the reserves" in your bank account. But make sure that money is available. I would also advise against trying 400 NL unless you have considerably more money (at least 5k of at-the-site money), having played there a while now, its a hard game to "solidly" beat unless you are HARINGHOLL.
wow... really