I love my 50mm 1.8 but I find its a little too long for general indoor shots on my 40D. So I'm in the market for another prime that's wider. Willing to spend ~$1000 and would prefer f2 and below. 2 I have in mind are the Sigma 20mm f/1.8 and the Sigma 30mm f/1.4 EX DC HSM. Can anyone speak for or against either of those 2 or recommend another?