Since you are new you might need some knowledge on Good, Reliable Manufacturers [Mostly, they still have their quirks]
Its ultimately your decision, And remember, you need extra mags and all that, Here goes the list
Echo 1- Lower to mid-range guns, Decent prices
G&G- Middle to High-range guns, Prices are EXTRAORDINARY considering quality you get out of the box.
KWA- High-range guns, High prices, but they are worth the price
Classic Army- Low to High range guns, Prices vary highly, from 125 for my sport-line mp5, to 600 dollars for a full metal and 1:1 scale M249. All and all good manufacturer.
G4 Series- These are custom guns only available from airsoft GI, They are an extraordinary value and would be a wonderful First AEG Depending on model 150-250.
If anyone has anything else to add i think the man has a decision to make,
On another note, This list might help you a bit,http://en.wikipedia.org/wiki/List_of_airsoft_manufacturers I would stay away from the Chinese manufacturers as A rule of thumb, You should be safe with American ones, but that list isn't up to date. Some Asian manufacturers are good don't get me wrong but until you get a little more experience with AEGs, I would stay with American Made