I don't think it's possible to make a good flying race with ECL +0.
Flight is a wonderful thing in a set-piece campaign. By the time my group was 7th level, each of us had found some method of flight, whether it was Wings of Flying, the spell, whatever. I was in a campaign once (9th level), where the DM just flat out said "no flight, no spider climbing, no wind walking, no teleporting..." because he was so sick of us just bypassing any challenges he came up with. It wasn't that he couldn't come up with things on the fly, it was just that it really made the adventures boring if we all just flew everywhere. He'd have to find some way to introduce flying nasties, and that begged the question, if there were so many flying predators, why hadn't anyone noticed them before now?
But Flight as a racial ability is tougher. All those movement abilities I mentioned above are useful, but they're also somewhat interchangeable and fairly easy to get once you bring magic into the equation. So, while at low level wings are easily a +1 or higher in their own rights, at high level they're either worthless or even a liability (you've got big wings on your back that you have to hide/protect/whatever). Many templates seem to compensate for this by giving abilities that scale up with level/HD (a Half-Celestial's spell-like abilities, for example).
Unfortunately, because of this I don't think there's any way to make an ECL +0 race that involves flying. You'd have to give it a bunch of negative stats to compensate at low levels, and those would either be meaningless (like saying "can't wear armor", since they'd just go spellcaster) or crippling at high levels. Giving it a dinky speed or maneuverability class isn't much of a downside, because the key is that the flying ability is THERE.
It's like exceptional ground speed past about 50': you just say "I go there" and the DM says "okay", and having the ability at all allows you to trivialize the challenge. Giving a Fly speed of 30' doesn't stop you from getting out of melee range of that Colossal Scorpion, at which point you can just pincushion him to death with arrows.