MF Dark chocolate is good. I like it a lot. I'm still working on making a convincing milk chocolate using their dark choc. It's slow going but I am not ready to throw in the towel.
Your Nutty Buddy idea sounds really good. I would use WF SC Crispy Wafer for the cone. Their wafer is really good.
Thanks for the idea! If I was making that,
likely will 
, I would use SSA Ice Cream and SSA Ice Cream Vanilla instead of LB's. LB ice cream is way too sweet for me. The SSA's aren't nearly as sweet (the wafer will add sweetness).
For the nut flavor, I would try FA Hazelnut first and only a few drops (2-3) cuz it's strong. Or perhaps FW Hazelnut or WF Hazelnut & Cream.
FA Nut Mix might be a good one to try too. Per HIC's notes:
This is not quite as potent as Hazelnut, but it's still quite strong. I taste hazelnut, walnut, and almond. This is good for nutty tobaccos. Try it in candy bar recipes with butterscotch, caramel, cocoa, chocolate, nougat, a little fresh cream. It's awesome in Torrone, very authentic Italian candy flavor. A little Maple Syrup or Honey make great sweeteners for it.
ETA: See SessionDrummer's SSA notes on ELR. He's pretty spot on with his extensive SSA reviews.