pUGfANmn: The question is whether to buy the set or just the irons and find a longer driver or 3W. Buying the K15 Iron set leaves me about 1200 for a driver, or just a short wait and just get the full K15s.
The level 58 G20 driver is probably best suited to the K15s. The K15 driver is a good driver and I used it successfully through Master and half of Tour Master, but I don't recommend it at those tiers. By then, you'll be leveled up enough to get the G20.
At 240 yards, you're not going to do a lot better anytime soon. It's somewhat high flying, but it's accurate and easy to hit. You won't impress anyone with your monster drives, but you'll be hitting from the fairway all day.
If you learn when and where (tail wind, downhill), and how much backspin to use from the tee, you can add another 10-15 yards on top of a centerball drive.
The achilles heel for the driver is it's loft when fighting a headwind. The ball acts like a kid with ADHD going to the store. It starts well, then just wanders off in the wrong direction.
I would buy the set and move up to a new driver later when you're not trying to learn 25 new things all at once. The K15 has the same meter speed as the rest of the set, and errant drives are less of a concern.