First off, an effects processor is going to give you a lot more options than a talk box. Unless, of course, you want every one of your songs to sound like a Peter Frampton concert. Get an effects processor first, but not anything made by Zoom, DOD, or any other crap companies because their effects are horrible. And don't let a sales person say something like, "This DOD processor is better than the older models though,". Because DOD has been putting the same effects chip in every processor for years. So do a lot of other companies, though. Go with Roland, Boss, or Korg and you'll never be let down.

Here's a helpful tip for future sales experiences:
-DOD is the same company as Zoom
-Boss, Roland, and Korg are all the same companies also
-The best twelve strings are made by Ibanez
-Steve Vai uses Ibanez
-Steve Vai is God, when I pray at night I pray to Steve... that's about all you need to know.