Give me some tips! I just switched from film to digital - Canon 30D. Now I'm a shopping for my 1st MacBook Pro... What is Essential? What is Unnecessary? 15" vs 17" screen 2GB vs 4GB memory 160GB hard drive vs 250 GB Resolution preferences? I shoot mostly protraits, children, families, weddings... I have been shooting film for 13 years, time to switch to digital... give me your opinions.