I highly recommend the low tech approach. I went full on Walstad method for my 10g and 20g tanks. No filter, powerhead, lots of plants. I moved to a what I will call a modified low tech on my 30g and 55g. You can see recent pictures of the 55g here:
http://www.aquariacentral.com/forums/showthread.php?249568-quot-new-quot-old-tank
I ditched the CO2, went for much lower lights and I dose about 1/2 of the Seachem recommended for N, P, K, trace and iron each week. I chose not to change out the gravel substrate in those 2 tanks because I really didn't want to tear them up. I never vacuum the gravel. I am trying to find a balance on water changes. The 10g and 20g rarely, if ever, need one. The 30g can go a bit longer. Still figuring out the optimum time frame for the 55g. It has been holding nitrates down well (I let the canister filters go too long in between cleaning at one point). Tom Barr is a proponent of getting enough plant matter in the tank to filter the tank and spends a lot of time discussing how changing water in a "natural" setup introduces fluctuating CO2 levels which promotes algae growth. (Stay tuned...) There are two other forums that deal quite a bit with natural methods - am I allowed to mention those here?
I fought (and I mean fought) BBA for ages in my 55g. There were points where I was ready to pull everything out and put it out at the curb. After greatly reducing the intensity of the lighting and going more low tech, I have achieved a balance where BBA no longer grows. The only trace of it in that tank is what I didn't completely pull out from the java fern jungle. I had some BGA when I first set up the 10g, but once I hit the initial outbreak with Maracyn and the tank had time to settle in once again no algae. Never any algae in my 30g. The 20g has quite a bit of hair algae, but the mollies and the swordtail like to graze on it, so I only take some out when it starts to bug me.
The chemistry and fast growth of a higher tech setup is very exciting for some. I did it for a while but got tired of the constant maintenance. Thanks for starting this thread - I think on this forum the fact there is another path to awesome plant growth sometimes gets lost. Much slower, but still awesome. The chemistry of the natural/low tech setup is cool too - just different. Test. Experiment. Try something new. In the end, go with what you enjoy.
I will post pictures of my 10g and 20g when I get a chance.
Definitely pick up a copy of "The Ecology of the Planted Aquarium" by Diana Walstad. Even if you don't use the method she discusses, it is an excellent read. For a real hoot, pick up a copy of the old classic "Exotic Aquarium Fishes" by Innes and you will see that the idea of using dirt/sand substrate and trying to achieve a "balanced aquarium" is a pretty old idea.