Some other advice:
1. Once you decide on a racket, price shop it online and see if the local vendor will match it. I always attempt to buy local, but I dont overpay local.
2. You should be able to get strings and stringing labor fee thrown in for free with your racket purchase. The online retailers normally do this. The locals around here dont always do this, but they run specials where strings are free with racket purchase. Strings can run you from $25-$40 including labor.
3. Also, many stores offer a discount on a bag when you buy your racket. They will give you the little single racket bag that wont hold anything but the racket with the purchase, but if you start playing regularly, you are going to want a bigger bag (3 or 6 racket bag). Utilize this time to get a discount. Again, price shop it online before buying though. I just got a $80 bag online for $40 shipped.
3. I didnt realize this at first, but get some tennis shoes designed for playing tennis. I tore thru a nice pair of Air Max's in about 3 weeks when I started playing. These run from $50-$130. Price, Nike, Addidas, Wilson, and Babolat all make them. I used Nike and Addidas for a while but once I tried Babolat, I havent tried any other brand. If you play 3-4 times a week like me, the shoes wont last 6 months, but most all offer a 6 month outsole warranty and will replace with a very small handling charge. I cut my purchase price in half by getting 2 pair of shoes for one purchase.
I play a lot of tennis and am a gear head, so feel free to ask any questions in the process.
Once I get old and nonathletic, I plan to focus all this energy on golf.