I had a pair of Burton Missions, they were a good starter binding. Not too stiff, no pressure points, and not too expensive. Tons of really good bindings out there and you'll find that everyone has their personal preference (yes, I ride some Burton stuff). Regardless of brand, snowboard equipment comes rated between 1 and 10 in stiffness. You don't need a stiff binding, you don't need to pay for the newest tech to save 0.4 lb's of weight on your board, and you don't need to spend $350 on a set of binders. As a beginner all you need is something that'll keep you attached to your snowboard. That being said, it wouldn't hurt to stay away from anything made by lamer, drake, firefly, or 5150. Ride, Union, Flow, Forum, and Burton all make reliable lower end bindings, try to find some on sale. When in doubt, swing by your local shop.
* Unless you have a Burton board with the channel system on it, you don't need EST style bindings
'12 Lib Tech T.rice / '12 Burton Cartels
'10 CustomX / '10 Co2 EST