That Boden dress is lovely, but I'd echo Jenni's question: Where are you going in it? Does your life have the kind of events, outings, or activities where this kind of dress fits in? In my very casual life, this dress would hang in the closet waiting for a time when it could be worn.
Before you start buying, I'd suggest you do an activity audit, so you're buying for your ACTUAL life, and not a fantasy life. My fantasy summer life would have me wafting around the countryside or charming villages, riding a vintage bicycle, sitting outside at cafes, etc. My real life has me driving around in a car in suffocating heat, sitting at my desk in an ultra casual office (where people wear shorts and flipflops), or trudging across a blazing-hot asphalt parking lot on my way to a big-box store to buy groceries.
To do the audit, write down the different kinds of activities you do, and what kinds of clothes you need for each one. You may find that 75% of your life needs durable, washable clothes and shoes you can run in, 15% needs a pulled-together casual look for running errands, and 10% needs a slightly nicer look for going out to dinner or attending an event. Once you know that, you can know where to put your shopping and buying energy.