Hi vito,
It might help if you could clarify your goals and aspirations with this tank as there are a few inconsistencies as noted by LondonDragon. It is your intent to run a low tech non-CO2 tank? If this is the case then the combination of items that you have listed is uncoordinated. If you are going the low tech route then the 54 watts of T8 is OK for this concept but not in conjunction with inert or low cost substrates. All of the nutritious substrates, including the Tropica have the same cost per litre more or less. If substrate cost is an issue for a low tech setup then you would want to look at something like a combination of Akadama (or sand) and generic potting soil (or compost) underneath. The Akadama (or sand) top layer keeps the underlying soil/compost sediment from polluting the water. It's a good idea though to prepare the Akadama as JamesC did in his sticky in this section:=>
http://www.ukaps.org/forum/viewtopic.php?f=17&t=741" onclick="window.open(this.href);return false;" onclick="window.open(this.href);return false;
Further, if you intend a non-CO2 setup, the choice of HC is not really a good one as this is a difficult plant to propagate even with CO2. This is true of most of the plants you listed actually.
Now, the situation isn't completely grim. You could still add a liquid CO2 product like Excel or Easycarbo but this is even more expensive long term than the Aquasoil so this might be false economy.
The carpet plants you listed are difficult and are probably not a good choice for a first planted tank although there are many success stories.
If you decide that you want a high tech CO2 injected setup then you have to give serious thought to the option of a yeast based system or a pressurized system. In a high tech setup the substrate choices are better as you can easily get away with an inert substrate such as sand or Akadama alone but water column dosing will become imperative so you'll need to study this a bit. But the money you save by not buying Aquasoil will be money spent on CO2 equipment so it's really not clear to me at all what your intent is or what your limitations are. The iwagumi crowd might bash me for saying this but I really think it is an advanced aquaculture concept and not for the beginner. I also don't think the "budget iwagumi" concept works very well.
The choice is yours at the end of the day, but my opinion is that you should aim to learn how grow simpler plants and to learn the basic concepts of aquaculture first before trying iwagumi, otherwise it could easily end up being your own personal battle of
Iwo jima. I would start with ferns, hygrophilas, stargrass, Lugwigias and swords or crypts first before moving on to advanced concepts. These could easily be grown in a low tech environment as described above and you could figure out nutrient dosing without getting into trouble, then perhaps move up the ladder to gas injection, then higher lighting and so on.
I would also suggest you go to the Tutorial section as there is a lot of good information there that discuss these issues in much greater detail.
Cheers,