Hi Khuli Loach,
If I were you, I would start with a small 'Amazon' type tank, with:
A pair if Apisto. agassizii 'Double Red' or cacatuoides
10x Cardinal Tetras (these are hardier than Neons, live longer, and have more colour)
About 5 Otos or cories, and maybe a small fancy Pleco, like Dekeyseria brachyura L168
5 Golden Pencilfish
3 Hatchetfish (I have to agree with you, they are awesome!)
If I were you I wouldn't get livebearers because I've found that they get boring after a while, unless you plan to breed particular colour strains and that sort of stuff.
Add some interesting pieces of bogwood, a few small species of Swordplant and some saggitaria, Twisted val, Crypts, and a bit of Hygrophila polysperma 'Rosanervig' for red, and a bit of Limnophila sessiliflora or Cabomba for a feathery texture.
For lighting, get a Hagen T5HO 60cm hood, fitted with 2x PowerGlo tubes.
Use sand for the substrate, 3 cm at the front, sloping to about 7 or 8 cm at the back. You could also add a 2-3 cm layer of JBL AquaBasis Plus underneath the sand for plant fertiliser, or you can use JBL Root Balls, which is just as effective and easier, but they need replacing once a year.
You can also use boiled dried oak leaves on the substrate or add peat to the filter (or do both) to add tannin to the water which will lower the pH, which is what those fish like, plus they will colour up a lot more nicely for you.
Hope that helps a little
Joe