I love Greek food and I'd like to try cooking it myself. I'm looking for a cookbook that is healthy yet authientic and will include dishes not typically found on Greek restaurant menus.

The Pillsbury website has a Greek cookbook worth checking out.

There is quite a few "authentic" Greek cookbooks out there for you to try!
One EXCELLENT book is The Complete Greek Cookbook, The Best of 3000 years of Greek Cooking!  This sells for $18.99 on Amazon right now!
specifics are:
The Complete Greek Cookbook contains the most comprehensive collection of Greek recipes ever published in this country with over one thousand variations of three hundred authentic recipes. They reflect a simplified modern approach to Greek cooking, step by step instructions, modified proportions of sugars, fats and oil, the use of instant foods and spices, tested short-cut methods and the use of appliances. Anecdotes and myths about the origins of these recipes makes this book fun to read and a treasure to have in the kitchen. This is a new edition of an Amazon five star classic which was revised in August 2000 that has sold over two hundred thousand copies

Another great choice is The Greek Cookbook:The Crown Classic Series which sells for $12.71.
specifics are:
The Greek Cookbook is a translation and adaptation of Greece's best-selling cookbook, containing 500 of its choicest recipes. Yet all of these -- many of them exotic by American standards -- use American measurements and can be easily prepared from ingredients readily available to the American cook.

Also there is The Complete Book of Greek Cooking which sells for $15.83!
specifics are:
More than 200 unique and intriguing recipes for all kinds of Greek dishes.