Go for it!!
I would agree with Raied and recommend going with a smaller tank (<50g) to start off with. You are going to make mistakes with SW. That is just part of the learning. When you have some success and really want a larger tank, then you are ready for the bigger investment. And you'll have a much better idea of what you really want, as there are lots of choices with fish, corals and tank/sump design.
But for sure, go to SW. I had FW many years ago, and eventually got bored with it. SW is much more challenging, but the rewards are greater, too. The trick is to go slow, though. A common mistake with SW newbies is they try to rush the cycling, etc, and add livestock way too soon.
Good luck. I am sure you will enjoy it.
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