It depends on what you want Kris.
For a beginner to RAH, Matt makes a good point, as the slide is one of the easier kits, and can look really good with some work.
The funhouses/darkrides are decent as well.
As for some of the larger rides, I have owned quite a few. I found the Zipper to be fairly easy, just time consuming. I'll say it now, whatever you decide on, it will take a fair amount of work, and dedication. The are not simple snap together kits.
I'm assuming this would be your first kit. So I'm going to go with the slide as well, as it gives you a feel for the vaccum formed plastic, and the typical RAH assembly process.
Justin