Hi, mizEm. Jim is thinking in terms of cutting siding but my guess is that you want to cut it more for craft items. The saw you choose is determined more by the tightness of the curved lines you need to cut for something like this. And most of the electric powered hand tools are just variations of their hand powered versions. A scroll saw is just a bigger version of the old coping saw, for instance. These will both cut pretty small curves. The next size up is the keyhole saw or its powered cousin, the saber saw. A carpenters hand saw is supposed to cut straight lines but a powered circular saw is better and a table saw is better yet for keeping the cuts straight. Whether you choose the hand or electri version is a function of cost and how much you will use it.
Let us know what you want to cut out and we'll try to give you some specific direction.