Wilson Hyper Hammer 5.3 Tennis Racquet
The Wilson Hyper Hammer 5.3 is a really nice choice for beginners. It offers a big 110 square inch frame along with a very light strung weight of 9.0 ounces. This is a very powerful racquet and you'll need to experiment with the string tension to find what's right for you. One recommendation is to start at the upper end of the recommended range of 53-63 pounds.
The stiffness rating of 70 means you have a very stiff frame, so at low string tensions, you may find the ball flying long on you. If a 60+ pound tension is a little hard on your arm then certainly go to the low end and work your way up to where you find control without any arm issues.