Field and Stream at Dicks Sports has a good deal that my buddy just got. They were around a 100, and they had build in gravel guards, Front and Inside Pocket, Hand Warmers, and even double knees. To be honest I was a little jealous. He spent a lot less money and had better waders then I do.
Next buy some Chota Wading Boots. They are extremely comfortable for long days, they do take forever to dry out though. Also around a 100 bucks.
There are a lot better waders out there, but for the price you are wanting to spend I thing you will get more features with these then most. Make sure to buy your Chota's from a local though.
"Give a man a fish and he will eat for a day. Teach him how to fish and he will sit in a boat and drink beer all day." ~Unknown~