Sumps are great for filtration and the health of the tank. There's just two side effects with a sump.
If you use a sump you'll limit yourself from using CO2 in the future. The CO2 will offgas out of the water when it goes through the sump. This means that most of the CO2 that you pump into the water will not be available for the plants. If you sure that you will not do C02 in the future then go for it.
The second downside is the sound. If you like the sound of running water then it's for you. It annoys me so I stick with a canisters.
If I were you I'd start with looking at what plants and stocking you want. Then you can put together the rest of the tank around what you choose. It's a lot of fun to figure out the substrate, hardscape, lighting, etc... to fit your plants and stocking.
If you use a sump you'll limit yourself from using CO2 in the future. The CO2 will offgas out of the water when it goes through the sump. This means that most of the CO2 that you pump into the water will not be available for the plants. If you sure that you will not do C02 in the future then go for it.
The second downside is the sound. If you like the sound of running water then it's for you. It annoys me so I stick with a canisters.
If I were you I'd start with looking at what plants and stocking you want. Then you can put together the rest of the tank around what you choose. It's a lot of fun to figure out the substrate, hardscape, lighting, etc... to fit your plants and stocking.