as per your slr question, the short answer is kinda.
it all depends on the crop factor of the camera- so for example- on the 20D you see through the lens and you see what would be considered to be a 1.0 crop factor- you see everything the lens sees. That's just a function of looking through a sight that looks down at a mirror through the lens (im making this very simple here). However, the sensor picking up the light when you fire the shutter is actually 1.6 times what you are looking through- so for example at 100mm, looking through the eyepiece you see a landscape with a tree on the far left and a statue on the far right. When you take the picture you actually lose part of the tree and part of the statute because of the size of the sensor. You get a visual equivalent of 160mm (1.6x100).
Any slr worth anything isn't worth viewing the lcd to take your picture.
I'd suggest seeing if you can find something with a 3200 ISO over a 1600. This is why- the highest iso is usually very grainy on a dslr, 1600 generally looks better on a camera that shoots up to 3200 than a camera that tops out at 1600. I highly suggest reading the very thorough reviews at dpreview.com