Hi, I am new to Arduino and I want to get one for some projects but I don't know which one to buy. The old first versions were designed around the 8-bit Atmel AVR microcontroller and the newer ones such as the Arduino Due use a 32-bit ARM core microcontroller. Does it matter which one I buy to use on some projects I see on this forum or on other websites? Are all the different Arduino boards compatible for all of the existing Arduino projects? That is, a 32-bit microcontroller would work on older projects that used a the 8-bit microcontroller? What would your recommend for a first Starter Kit with an Arduino board? Thanks much.