Edit: and at current difficulty (16,819), the exchange rate has to fall below .009 before mining SolidCoins is less profitable than Bitcoins.
At difficulty 16819, the parity would be 0.01455053 right?
(16819 / 32) / (1806098 / 50)
You are correct. I forgot about the 32 coins

It briefly dipped below parity earlier today. Still, as someone elsewhere said, 'I do not mine for what the price of coins are today, I mine for what they will be in the future'. All miners are inherently long on whatever coins they are mining, and it appears by the network graphs that more and more miners are long SolidCoins.
But coins are also generated faster (32 every 3 minutes vs BTC at 50 per 10 minutes), so its even more in favor of SC
If anyone is interested, I need someone to double check the math on my (very messy) spreadsheet to figure out if SC or BTC is more profitable to mine.