It's fun to fly and seems to be in a better state of completion than than the Viper / Hornet so I do think it's worth buying now and saving $10. Of course you can wait for a sale and pick it up later on.
Having different weapons to learn to use will also be interesting.
Most of my DCS is spent flying the Hornet. I bought the Viper but have hardly flown it. The JF17, I feel more excited about and I'm sure I'll spend more time in it.