Fox Mulder
The Truth Is Out There
what would the effect of a plate reverb be as opposed to a hall reverb or something along these lines.
That completely depends upon your taste and what a certain mix calls for. A plate reverb sound like stuff's being reflected from a metal plate, and as for hall... you guessed it. It would sound like a hall.
Regarding you EQ you'd want to hipass and get rid of low-end clutter (if there are any, that is). I prefer doing that around 200hz or so. I really don't know if that's a general rule, but it just sounds okay-ish to me. Get rid of the top-end mess as mentioned above. Try using a de-esser as ahjteam mentioned above.