You used to be able to get a Xiang Sheng for under US$200 on eBay, but the one seller I'm familiar with seems to have stopped selling. I would start by looking at that. It's more than decent, it's delicious.

The Radii/Moretto HAP-03 was also pretty popular for around that price point.

Yes, I've heard rumours that Senn is about to come out with HD-700, but don't quote me on that.