Anything other than a rivet forge is a pretty large investment for a hobby you're just starting and may not stick with, not to mention you don't really know what you'll need out of a forge.
You can build a jabod for little to no money and be forging by tonight. I'm currently on my third jabod and would recommend them to anyone looking to get into smithing who wants to use solid fuel. Good luck, be safe, and remember it's supposed to be fun.
Pnut