Thanks everyone for your help. I've used the Canon 1.4, and I do like it, though I've been warned to stop down. If the new Canon 1.8 IS or Sigma 1.4 is better wide open, it sounds like it would be worth paying for, when it comes out. Everyone's been so impressed with Sigma lately, I imagine their new 50 will be a very nice lens.
But in the meantime, all I have is a 14mm Samyang, which doesn't really qualify as a normal walk-around lens.
Sounds from you guys like if I get the the Canon 1.4 refurbished, and in a year I'm thoroughly impressed by some new lens, it won't be a huge monetary loss if I sell it. I have to keep reminding myself that the more important part is getting out and taking good pictures.