Ok folks, I know this isn't really a fair comparison for multiple reasons, but I'm asking you to help me out. I've had my 500D for a couple of years now, and really like it. Honestly, I wanted a mid range body first, but my wife talked some sense (read: cents) into me and we ended up with it. Months later, I upgraded the kit lens to a Tamron 17-50 f2.8 (non VR). About the same time I borrowed (and ended up keeping) a Canon 50mm f1.8. This lens is almost always better, but for the length on a 1.6x body. This has led me to really want a full-frame body. I can find a used 5D for about $900. I would use the 50mm f1.8 exclusively, and would love the low-noise (most of my current shooting is of my 3.5 year old indoors) and weather sealing. I also have a 70-300 IS USM that I would use when/if the kids get into sports. The other option would be to spring for a 35mm f1.4 L. I've heard this is a ridiculous lens, and that usually a better lens on a sub-par body is the way to go, but I just can't get over my lust for a full-frame body. So the question, I suppose, isn't really fair. It should be Canon 500D w/35mm L vs Canon 5D w/50mm f1.8? Thoughts?