17 seats & the girly bits
That is a beautiful bike!
As you improve you will change seats and position. Plan on it.
Your neck will hurt until those muscles get used to their new job. It gets better with every mile. If it is more comfortable, ride uprite for now. Stay out of the drops until you develop stronger neck muscles. Then ride that way for a short time during each ride. Remember to treat it like a really fun workout.
When you get to longer rides (20 miles) you might want to think about a different stem length. Your position will change.
Before I saw a pro, for a fitting, I bought a seat with the cut out for my girly bits. It was the right size, (155) but 7 miles on that sucker and I was in tears. I kept going and when I got done with my 20 (I cut it short) it took me 12 weeks to recover! I couldn't ride at all. I could barely sit! My ginny wasn't the same for a long, long time. No cut outs for me! That seat really set my training and weight loss back.
So the pro I went to tried 15 different seats with me. He was very patient. While many are saying that the Bontrager seats aren't that great, that's what I ended up with and it's the best (for me). It's actually an old model that the pro gave me.
Doesn't matter what it looks like, or what some people think you should be on. Get the one that makes you comfortable. You can always change it when you've gotten comfortable riding in a different position.
After 1,500 miles on my beautiful bike I still love my seat. I've tried a less cushy seat and it cuts my ride short because of the pain. I've tried a bigger, touring seat and it cut off my circulation and became really uncomfortable after just 5 miles.
Just call me Goldylocks. 'Cause my old seat is just right.