A simple question but a complex answer!
If you just need new shocks and want the cheapest option you can't go too far wrong with Monroe or equivalent from Autozone. They do sell some 'upgraded' gas shocks and they often come on sale. That will be better than running worn out shocks, but it is basically an OEM replacement for less money. Often have sales, too, which is nice.
If you have a bit of extra money, Rancho shocks go on sale from time to time -- 4 for the price of 3. These are adjustable and generally have favourable reviews. But, they are more expensive than Monroe.
A bit more money, you could look at Bilsteins.
Here's where it gets complex: The right "shock" is actually a critical mating of three factors -- the load you are carrying in a given vehicle, the spring rate, and the shock tuning.
If you have shocks that are not tuned to your springs, you'll end up either with too stiff of a shock -- so your springs can't do their job and compress quickly enough on the road when you hit a bump -- or too light of a shock, so your vehicle will bounce down the road because the shocks do not dampen the spring action well enough. And of course, your vehicle will be asking different things of the suspension empty than it will when laden down with gear.
So with all the above you need to consider -- are you replacing springs too? Or keeping your original ones? If you are, that will narrow down your shopping as you can buy OEM-replacement shocks which will be tuned to the springs that came with the rig. With a vehicle of that age though, you are likely going to need to get new springs as well as they do loose their springiness over time.
Your best option is to find a suspension kit (shocks and springs) for your vehicle, that is either tuned to the weight you typically carry OR has a progressive spring so that it can adjust to varying loads.
Old Man Emu (ARB), AEV, Teraflex are all good brands of suspension kits, but they are not 'affordable' for some folks as they are $$.
