As far as converting chariots...
I picked the new ones for cheap somewhere, and replaced the horses with cold ones. When I get around to painting them, I'm going to use High Elf colors... then beat the heck out of them and spatter them with reddish-brown to demonstrate the 'change of ownership'...
If you are going to go magic-heavy, you might need to go all-out and get two sorceresses to do the job at this point level. But that will likely leave you very vulnerable becuase you're not going to have a lot of troops to back them up. Even the Ring of Hotek isn't much use at 1000 points because most spells being cast only use one or two dice anyway, the odds of doubles coming up is slim to none. Seal Of Ghrond on a Master would be your best, cheapest bet... assuming you even want to bother.
In general, command groups are optional for Dark Elves. They are almost always too expensive for what they provide in benefit. Exceptions include Spearmen (standard provides +1 SCR, always useful for them, take the Warbanner for another +1 whenever possible!), Witches (when you have points to spare, Standard with Banner of Murder and/or Hag with +d3 attacks is mean!), and Black Guard (Standard w/Banner of Hag Graef is very nice, Champ with Crimson Death can take many heroes, or in higher point games give him the Ring of Hotek to free up points on characters), and musicians when you have points left over (Dark Riders get first crack, then whatever else you think might need the
CR tiebreaker and/or need to rally).
Try and get a second
RBT if you can. Two
RBTs do much better than a single one.