This will be a shared anniversary gift and the vacation is costing us
nothing because of a friend's good heart. What would I need to pay for a
camera such as you describe needing
two lenses? This trip is a once-in-a-lifetime opportunity and we will
probably never go to such beautiful places again. Many thanks.
I think you are referring to a dSLR, which has a larger sensor and uses interchangeable lenses. If that is correct, you are talking about a quantum jump in technology and, to some extent, price. Entry level dSLR's start in the 6 megapixel range (perfectly adequate, too, btw), and around $400 for a Pentax K110D with kit lens. Beyond the basic body and kit lens, the sky is the limit in terms of what you can spend for lenses and other accessories.
Canon and Nikon also offer entry level dSLR's but their prices start at around $600 and $525, respectively, and go up from there. Prices based on buying online.
If you decide that a dSLR is the way you should go, keep in mind that a dSLR is meant to be a system, and to use it to its full potential, one needs (and will probably want) more than just a body and kit lens.
My personal opinion, even though I'm a Nikon driver, is that the Pentax K110D and K100D represent the best ROI in entry level dSLR's at this time. The others are fine, and I am very happy with my Nikon stuff, but dollar for dollar, it'd be hard to go wrong with a $400 K110D.
~YEKCIM