Simple is best!
You can always add hours or upgrade. Just make sure you get the date you want. You're timeline will shape up as your plans unfold. The main thing is understanding if the type and style of photos you want will require a certain time of day, or a particular moment to unfold. I know some people feel very strongly about sunset photos. That means you'll want your photographer to be there at sunset... and in July, that's like 9:30 pm! Once you really start wrapping your head around what you hope to see (are you hoping for night photos, do you have a sparkler exit, how much of the "getting ready" scene do you really need?) you'll know better what to plan for. So, my advice is to secure your date with a small investment that covers the basics (the Small Day package is amazing for that) and then add hours or upgrade if necessary.