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Would that still resolve a viewable image?
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On most nights, no. Well, you'll see something, but it'll be blurry and appear out of focus.. thanks to the seeing conditions it's rare that you can push beyond 200x.
Of course you *want* the eyepieces that will allow you to go higher on nights of good seeing. So it could be a good idea to get a 15mm eyepiece and a 2x barlow.
If it's in your budget, I'd get a 15mm TV plossl (approx $150) and a 2x orion shorty plus (approx $150).
The 15mm barlowed (to 7.5mm) will be a good planetary eyepiece on most nights, giving you 166x. When the seeing is much better, you could barlow your 9mm.