will be easy for the WC's and your dosing
I loved my planted tanks (a 200L and then another, lot more successful 120L)
Have you got it all planned out?
I never went down the under gravel heating route but did buy all the kit - then took it back when I couldnt be bothered to strip the tank down to add it! What substrate are you going to use? I went for 2 grades of sand - then laterite and finally small gravel. It worked really well but I always fancied trying peat
I also went a little too far down the fertiliser route and went down the "EI" route... worked really well but it turned into a chemistry lesson.
I spent more money on plants and trying to keep them alive than I ever did on fish!
I guess since its Dennerle it comes with a decent amount of lighting - and I hope it uses their topical tubes... Very yellow light but the plants do love it