I was working a couple of years as flight instructor and your question was asked many times to me. As you say, you would like later on to fly in Holland, ergo you will need a JAA licence. There are different ways to get it and finally how you get it needs to be good for you. This you should find out, before you start to spend money. For this I strongly recommend you to talk to various schools. A good thing is also to talk to people who did it recently. I don't know if the Dutch Aero Club can help as well, but it's at least worth a try. You also have the Aircraft Owners & Pilots Association (AOPA) in Holland. Ask them as well, they can be a big help.
Collect a couple of offers. Don't get fooled by schools offering you a cheap package. Once your credit is turned into aircraft noise they will push you trough an exam even if you are not at the level you desire.
If you do it in the US, I strongly recommend you to check out schools like Flight Safety or American Flyers. They may be able to offer you even a JAA compatible course. Another good thing for example with Flight Saftey is, they offer all kind of training. This means from the PPL trough IR
, CPL and ATPL till any Type Rating you could desire. They also run a couple of JAA approved TRTO's, maybe even FTO's. You will need stuff like JAA MCC
Training, CRM and so on. Flight Saftey offers this.
Many European Airlines do parts of their training in the States. In the States they can go on faster, because the weather in those locations is generally better and you will be annoyed by less regulations. You are basically able to fly 24 hours a day, something you can't overhere as the airports close at night. Also landing fees are normally free in the US and you will need something between 150 and 250 for your PPL only. If you multiply by 10 Euros it makes up quite a sum. But they come back and finish up the training here in Europe. The reason is under others, you will fly here and should get familiar with the procedures and structures here.
Make a good analysis, then it will work. I suggest you to contact the department, responsible for training in your local aeronautical authority. Ask them what you will need to bring along and to do, in order to obtain the JAA licence. This can avoid you an enormous amount of trouble. You could also contact one of the airlines you might like to work for and ask them what they recommend.
It's worth to do it in advance. I could tell you stories like the guy how did a complete JAA approved type rating for a 737. The only thing that was not JAA approved was the simulator they used for. The course was void and it resulted in a bad dream. So take your time and it will work. Good luck and my best wishes!