I swear when I was at $2NL, I couldn't find the fish to save my life. Everyone thinks I'm crazy when I say that, but I swear it's true. Found way more fish at $5NL at Poker Stars then fish at $2NL at Full Tilt. Full Tilt $2NL players were all so nitty in my experience.

Anyways, I'm in a similar situation as you. Our bankrolls are actually the same (if you're still at $280-ish) and I got about $100 from heads up s&g's and maybe $30 from FR. I'm contemplating whether I should move up to $10NL as my whole bankroll is rolled for it, or whether I should move up when I make enough from $5NL to justify the move. For the time being, I'm gonna have "two" bankrolls, one for s&g's and one for cash games until someone tells me that is stupid (which I doubt) or until I feel I'm ready to move up to $10NL.

As for your case, I would move on up to $5NL right away and use your whole bankroll for it (make a larger stop loss because going down two buy-ins on your first attempt at the next level is very common). I say this because in my experience, and a couple of other guys' experience, $5NL plays identical to $2NL but with more money.

Good luck and I'll be following your OP now!