I've been wanting to pick up a refurb 50D (what with the CLP prices dropping to under $600 with shipping). I like that the T1i has video and everything and I'll keep it around for that or as a walk-around camera, and to use the 50D for anything beyond 'walking around' (shoots for people/portraits/planned landscapes, etc).
The price seems to make it worth it -- when I checked out the 50D I thought it handled low-light much better than my T1i. I guess the question (and, admittedly, this is a loaded question) is whether or not it would be worth it to invest the money into a second, potentially higher quality body.
Of course, the other option I have is to save that money and spend it on some higher quality glass (been thinking about selling the 17-85 and picking up a 70-200 F/4L as my first L glass). Decisions, decisions..
Love your flame logo-ed lens!
Well, that makes the decision a bit easier. 
