Further searching turned up the device best suited for my need, MPXV5100GP for measuring water level. It runs on 5v, has integrated amplification and puts out .2 to 4.7, and Digikey has them for $11.81 q1
Here is data sheet: http://www.freescale.com/files/sensors/doc/data_sheet/MPX5100.pdf
Thanks everyone for responses.