Nice looking bike.

How much higher do you think you want the bars? Do you want them closer to you as well? If it is just a little higher and closer to you, you may achieve that with a new stem. Otherwise a riser bar might be a good idea as well.

Not a fan of adjustable stems myself, but some folks like them and if you are just riding on the road or bike paths, they should be fine. If it sounds like a good idea to you, go for it.