I am also planning to visit Bali in Aug. I have already booked in seminyak but if you haven't booked yet then prefer kuta. kuta is closer to other destinations and more happening. and do keep a night stay at nusa penida. Spa in ubud is a must.
I hope you have made your trip. It would be helpful for travellers if you share the travel details:
1.Route
2.Transportation
3.Weather
4.Budget
5.Places to see
6.Tips for travellers etc.
Happy travelling.