(2) Bluetooth connectivity (see item 1)
(3) 32 bit analog data.
Just get a 32-bit processor like ARM or PIC32 or AVR32 or whatever you feel is best but I think that you should give some flexibility this is because:
I normally install a $10k to $15k PLC panel to do what I think can be done with a micro.
If you are replacing something normally costing that much the extra $1-3 dollars is not going to be noticed and will be seen as a drop in the bucket however the performance you gain will be noticed a lot. You can use an atmega if you want and it will do it but I am just saying that there is no reason to cheap out for an 8-bit processor. Also you can buy 32-bit micro-controllers with built-in Bluetooth so you may actually save money. By googling Bluetooth Soc ARM I found this in about one minute http://www.mouser.com/ProductDetail/Nordic-Semiconductor/nRF51822-QFAA-R7/?qs=sGAEpiMZZMvQqVCO1QUkez7sIZGL4lOYjddp8D7wMfY%3d