Don't always assume a higher price is a better gun. Airsoft prices in Canada have been coming down dramatically over the last couple of years, for instance $600 dollars is near twice what should pay for a KWA MP7 right now. Some retailers prices still reflect those of two years ago. It's not uncommon to find the exact same gun listed at different two retailers hundreds of dollars apart. Be sure to shop around.
Best for you to decide what model of gun you want first, AK G36,M4 etc, that may severally narrow your options.