If you stick with Microchip you can leverage their free libraries for graphics, wireless, SD cards, oh just about everything you need is there somewhere and all free if you use it on their chips.

The only sticking point is to choose your display from one of their supported types, unless you want to write the low level driver code yourself. From looking over the driver code for my device (it had a missing 1 line bug that took me a week to find) it isn't the worst thing to write your own, but why not get a wheel that's already round?

 

If you stick with Microchip you can leverage their free libraries for graphics, wireless, SD cards, oh just about everything you need is there somewhere and all free if you use it on their chips.

The only sticking point is to choose your display from one of their supported types, unless you want to write the low level driver code yourself. From looking over the driver code for my device (it had a missing 1 line bug that took me a week to find) it isn't the worst thing to write your own, but why not get a wheel that's already round?

I took your advice and tried to research more on the microchip products. Here is what I have in mind, let me know what you think:
MCU for the sensors: http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en556021
RF Transceiver (2 of them, for sensors and lcd): http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en535967
Display: http://www.digikey.com/product-deta...F-ATXL#-T/NHD-4.3-480272EF-ATXL#-T-ND/3597748 [OR]
http://www.techtoys.com.hk/Displays/TY430TFT480272/TY430TFT480272Rev04.htm
LCD Controller: http://www.techtoys.com.hk/Components/SSD1963QL9/SSD1963QL9.htm

I am not sure about the LCD MCU yet.
Also I was looking at this touch screen controller (Do I actually need it or the SSD1963 controller is enough)?
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en557223

 

If you stick with Microchip you can leverage their free libraries for graphics, wireless, SD cards, oh just about everything you need is there somewhere and all free if you use it on their chips.

The only sticking point is to choose your display from one of their supported types, unless you want to write the low level driver code yourself. From looking over the driver code for my device (it had a missing 1 line bug that took me a week to find) it isn't the worst thing to write your own, but why not get a wheel that's already round?

Some displays include a C framework. It is not difficult to port it to PIC.
But you need flash writer technology. This is not included.