As the first to comment I would suggest a 22" weber smokey joe. It's about $75, can grill and smoke, and while not as deep as a weber kettle it's super cheap and can do everything a kettle can after you get to know it.

MODS:

You'll want to get a disposable pizza pan (you won't be disposing of it) and put on the charcoal grate and bend about 1/3rd of it up to make a home made slow-and-sear 2 zone cooking area for about $5. This is what I use because I live in idaho and unless I restrict the air flow to mostly though the coals it's too cold to smoke with right now. It hit 17F last Sunday.

Next mod would be to get a non-teflon pot about 8-10 inches wide and cut the bottom off so that the top fits between the charcoal and cooking grate (you will at minimum need a hacksaw for this), and another disposable foil pizza pan to cut the center out of that isn't larger than the pot. Put the pizza pan on the grate and the pot on top and you have a vortex mod for about $10. Now you can smoke a bunch of chicken legs or similar sized meat evenly. This is also what I do but only because I'm not going to spend $30 on $2 worth of steal in a cone shape, and it doesn't need to be a cone shape, just add more charcoal if you're running low.

Use chunks for smoke flavor and put them on the grate before you put coals in. The charcoal should be lit before you put it in the grill, but if you can't it's okay. It will just take longer to get up to temp before you put the meat on. I has a charcoal chimney so I don't the best way to lite coals without one unfortunately. I'm actually so lazy that I have a 200,000btu propane torch that I lite my chimney with. So I have very little advice on the best way to lite charcoal unfortunately.

The only issue though is that a weber smokey joe does NOT come with a built in thermometer. Built in thermometers aren't accurate to what heat the food is receiving but you'll need something to measure the inside grill temp without lifting the lid. You can get a cheap barbecue/grill thermometer on amazon for a little less then $15 and drill a hole for it yourself, which many people do, or get a digital unit with temperature probes. The digital units run anywhere from $20 to $200 depending on quality and features.

So, less then $130, some hand made mods, a couple tools, and you have a smoker/grill that is quite a bit bigger and more versatile than what you have at the moment.