Hey guys, quick question. I'm loving my D50 so far (had it a few weeks), and I've got 2 lenses for it at the moment. I have the stock 18-55mm f/3.5-5.6g Nikkor lens, as well as the 70-300mm f/4-5.6g Nikkor Nikon lens w/a few filters. Both have been working great. The more I look over forums, especially at portraits, the more I see the 50mm/1.8 lenses. Do you really see a reason to add the 50mm/1.8 to my kit? I guess I'm just trying to figure out if it's worth it to buy it, given the 2 lenses that I have right now... P.S. Do you think it'd be worth it to sell my 18-55mm lens and just keep the 50mm/1.8 if I got it? What are the advantages to both? Could the 50mm/1.8 just take the place of my 18-55mm? Thanks! P.P.S. If I can get the 50mm/1.8 for $100, or the 50mm/1.4D for $175, would you splurge for the extra speed/quality?