Is the Canon Powershot S1 a camera worth buying? I hope to take close ups of animals and landscaping shots. Will this camera be able to take pictures like the very high quality ones I see on this forum? What type of lens would I be able to add to this? I'm capable of buying this camera for $150 off craigslist. Should I just wait for a chance to buy a Nikon D Series or similar camera, or are the Powershot and D Series similar?