Sounds like a plan! I'm in the same situation... druelling over the new Wild Riders in my local GW window every day on my way to work.
Also, I don't know how long have you been painting on the whole, but I thought I'd share my knowledge of painting WH Wood Elves with you. While older miniatures, I would strongly recommend a box or two of the Glade Guard as they are quite rewarding to paint and are very versatile as well, literally no two of my thirty or so Glade Guard have the same pose. To paint, I have six foresty colour palettes and paint each Glade Guard component differently (cloak/tunic/skirt/trousers/etc.) so there are probably about twelve different colour schemes in my Glade Guard overall. Using various GW greens, browns and yellows I've devised six palettes (see below). Just another idea as well, rather than buying foliage for the Treeman, use a lightly crushed up mixture of dried herbs. I find oregano, parsley, basil and thyme work the best, it gives a variety of leaf shapes and colours that look fantastic on bases, much better than any shop-bought terrain thingamajigs.
Dark GreenBase = Caliban Green
Wash = Nuln Oil
Layer = Caliban Green
Edge Highlight = Caliban Green + Loren Forest (1:1)
Moss GreenBase = Castellan Green
Wash = Nuln Oil
Layer = Castellan Green
Highlight = Castellan Green + Ogryn Camo (3:1)
Edge Highlight = Castellan Green + Ogryn Camo (1:1)
Leaf GreenBase = Waaagh! Flesh
Layer = Warpstone Glow
Highlight = Warpstone Glow + Moot Green (3:1)
Edge Highlight = Warpstone Glow + Moot Green (1:1)
Pale GreenBase = Loren Forest
Wash = Athonian Camoshade
Layer = Loren Forest
Highlight = Loren Forest + Nurgling Green (1:1)
Edge Highlight = Nurgling Green
OchreBase = XV-88
Wash = Dryad Bark
Layer = XV-88 + Balor Brown (1:1)
Highlight = XV-88 + Karak Stone (1:1)
Edge Highlight = XV-88 + Ushabti Bone (1:1)
Dark BrownBase = Dryad Bark
Layer = Dryad Bark + Gorthor Brown (1:1)
Edge Highlight = Gorthor Brown