I see a lot of people playing with expensive K-Factor and N-Code rackets who absolutely should NOT be playing with those rackets and would probably enjoy tennis way more if they could just stop thinking they need to play with Federer's racket.
Yesterday's expensive racket is today's cheap racket often times, and it's not because of marijuana that a lot of people still prefer older rackets like the Prestige, Prince Graphite, and Pro Staff. Despite what racket companies will have you believe, the tennis racket is NOT being re-invented every year. But it's easy to see why they make it sound like every few months a new ground breaking technique or material is being used, because they need to keep selling rackets despite recreational tennis numbers not growing the way it used to. So they need to trick people who already own perfectly good rackets to buy a new one.
Anyway, like people have been saying, for a beginner, get a cheap racket. Even when you get better, don't think that more expensive rackets are better for you.