For your first smoker, the easiest and cheapest options are electric or propane. Those are smokers you don't need to constantly babysit to get good results. You can get plenty of smoke flavor with electric, BTW.
You won't get a "smoke ring" with electric, but you'll get flavor. I started with a Masterbuilt 40" propane smoker that I bought for about $150, and the main reason I got it over the electrics was capacity. Most of the electrics are not as wide or large. But both options are great for learning.
If you want something BGE-style but don't want to pay those prices, pick up a
Char-Griller Akorn. It's every bit as good functionally as the more expensive ceramic kamado grills. Being metal, it has the chance that it might eventually have rust problems, and I've heard their build quality may not be at BGE levels. But for the price, you get a great Kamado. FYI I say that as someone with two Kamado Joe's, one Big Joe and one Joe Jr. I have no disdain for the Akorn as a "cheap knockoff"; the Akorn is a solid grill at a great price point. The learning curve of a kamado is steeper than an electric or propane smoker, but they're also more versatile. You can sear the hell out of a steak. You can use it as a pizza oven.
I like the idea of a pellet smoker if you already have another grill (for searing) and if you're okay spending the money. They're definitely "set and forget" and will produce good food. But again, typically the starting price point is a lot higher, especially if you want to be cooking larger quantities of food -- you can fit more in a typical "box-style" electric or propane smoker than the smaller, less expensive pellet grills. And when you start getting into the bigger pellet grills, you get up into the $700-1000 range. And they still can't sear. That said, a good pellet grill is a long-term purchase, whereas an electric or propane smoker might be a "learning tool" smoker; at least it was for me.
What you probably want to avoid are cheap offset smokers. The build quality usually leaves a LOT to be desired, they are hard to temp control and both get a hot enough fire to burn off volatile compounds while also not getting the cooking chamber well over the desired temp. And you'll have to babysit them constantly. I know the allure of "cooking with a stickburner" is strong, but IMHO it's not worth it at these price points.