Quick guide to equipment.
Tanks. These come in all glass or acrilic. Glass is harder to scratch, but is heavier and more easy to break. Acrilic is easily scratched but more durable; it bends before breaking. I prefur glass, as nothing near (or in) my tanks are going to break panes
Heaters. Electronic types fail off, avoiding cooking fish, but as yet are not very well proven. By-metalic strip controlled heaters are proven to last well, but tend to fail on, cooking fish, when they do eventually fail. In theory, electronic heaters will be more reliable than by-metalic strips, as the latter wears out over time, electronics shouldn't. A lot also depends on build quality. I'd get either a Visitherm for internal heating, as some 30 year old heters from them are still going strong. Expaect to pay more for this brand though, as they are the best at the moment
You can also get exturnal heaters, that go in-line. These haven't been arround long, but have so-far proven reliable. You need an exturnal filter to run one though...
Filters. These come in five main types. Internal, HOB, UGF, exturnal and air driven. Internal are cheap and reliable, but tend to clogg quickly, same with UGF, and UGF is also harder to clean, but cheaper at outlay. I have never used a HOB, so don't know much about them. Air driven are good for small tanks, but can lack "punch" in larger tanks, and they also aren't very good with plants... Exturnals are the best, being low-maintanance and durable. They are however, the most expencive type...
Lighting. What you see is what you get with it. If you want to grow plants, you should look for scope to up-grade lighting at a later date
This rules out most "kit" hoods, but this isn't an issue if you will only keep fish
HTH
Rabbut