Hopefully you won't go the route I did...but I got lucky. I bought a cheapo tripod 35 years ago that by todays standards, is quite sturdy. I used it primarily for when I was taking pictures of trains with two cameras, both mounted and ready. I put it all away until I got into digital photography about 10 years ago. I still have that trusty 'ol tripod...3 way tilt/flip/spin with a handle sticking out the back. Works great for the handful of times per year I use it.
About 5 years ago, I got a cheapo monopod, and a cheapo ball head to go with it for my Canon G5 point and shoot with a 550EX flash on top for use at church events. Did the job for the point and shoot. Until after a couple of upgrades to a 60D and L glass. Too heavy. So I upgraded the monopod, still in the lower end, but lightweight. Then I went to an L bracket for the flash, which necessitated a more heavy duty ball head, so I went with a Kirk. And a Kirk clamp now sits atop my tripod, on the same tilt/flip/spin head.
Two basic questions you have to ask yourself...Do you need/want a good strong setup (pricey$$$) or would something mid-range be more suitable. As mentioned above, you don't want several thousand dollars worth of equipment to be on 'shakey legs'. Be especially diligent to the weight maximums shown for tripods and heads. I figure about 10 pounds, or more capacity. No, I don't want to have 10 pounds on it, but a little overkill won't hurt.
Second, do you want to go to a quick-release system? L brackets are surprisingly expensive for what you get ($150-200ish). An L bracket is great for mounting flash and other hardware 'off camera' in addition to its quick landscape/portrait switching capabilities with an appropriate clamp. Or would a simple quick release mount on the bottom of your camera be sufficient? Note that without an L bracket, you're limited to tipping the camera on its side while mounted through the bottom hole with a tripod, regardless of head type. Unless you have a rock-steady tripod, it may become quite unstable due to the shifted center of gravity.
Unfortunately, a fact of life is that good, sturdy tripods and heads are not cheap. And if you buy cheap, you might end up having to buy a good one later on.