Speed, no don't start with 2-box if you have never detected before. I assume you want
to look for caches but walking around with that contraption will bring you unwanted
attention and the learning curve will be frustrating. Unless you have definite knowledge
of the location of a buried cache start with a beginner detector. Something like a Tesoro
Silver U-Max. Only a suggestion.
Curse!!!! Eurotek Pro is the best value for $218 or $299 depending on which coil you get. Compare YouTube videos of the two and see which has a very annoying audio and the other has a sweet sounding audio.
What about the ACE 350 - I hear people praise it and people curse it