I think that is a good plant list.Microsorum pteropus "Short Narrow Leaf"
-Bucephalandra Mini kir royale + mini velvet green + Brownie blue
-java spring moss (mini weeping)
-fissidens fox
-cryptocoryne parva
-Limnobium laevigatum
Thanks.
About pricing, dennerle sells these kit options:
-Nano cube betta 20l (non led lightning 11w+inter corner filter+tank+tank top):69€ on amazon (best choice to me)
-Nano cube complete plus (same as betta but with complete dennerle soil and shrimp food): 99€ amazon.
-Nano cube led (same as complete but with dennerle led 5.0): 143€ amazon.
That´s it, in my opinion dennerle is expensive, tank is ok (far from an optiwhite in terms of finition but the front rounded corners are cool), internal filter is silent but that´s it.
I bought this kit (nano cube 20l+chihiros aquasky led) 40€ from a friend, that was si cheap I Couldn't resist. I also added an 10€ external mini filter.