if you can save up a little more, the 200/2.8 prime would be a good choice, or if you are patient i've seen them go on ebay for 650
btw you can get the 50/1.4 for $499 from
http://www.d-d-photographics.com.au or a little less if you import it yourself
don't feel bad about getting a 50mm non L lens, I have the $1700 50/1.2 and it's not as sharp as the 1.4 or 1.8 stopped down a tad - but it does have other qualities :p