I just helped my cousin plan her engagement and we faced the same thing — wanted something elegant, but not overdone. We ended up going with
dreamballoon.store, and they had a great “engagement & love” collection. We chose a blush and white arch with custom gold-letter balloons. It was delivered and set up exactly when we needed it, and the final look was perfect for pictures. The site was easy to navigate and had a bunch of ready-made combos too. Honestly, Dream balloon made the whole process way easier than I expected.