Deciding the SRAM requirement

Hi,

I want to select a new ARM controller for my project. I am thinking of going for LPC2103 which is having 32KB of FLASH and 8KB of SRAM. My code size will be less than 32KB, but I am not sure if the SRAM of size 8KB be enough. So, I have following queries.

1. What are the criteria for for selecting the controller with correct SRAM?
2. Do the manufacturers take care of this? (because I have observed that as the FLASH size on a controller increases, SRAM size on the controller also increases)
3. What is SRAM exactly used for on the controllers? (Building cache memory is one of the uses I know. What are the other uses?)

Regards,
Sagar J.