Recommend any ADC ICs?
Use the built-in ADC on the AVR microcontroller.  Even if you have to choose an AVR with a slightly higher pin count and slightly higher cost, the total system cost and PCB size will likely be smaller.  Reduced parts count typically results in higher reliability as well.  

There are several AVR choices with 10 and 12 bit A/D converters.  See the Parametric Product Table for more info.