Going by the bands you have listed, I'd go for a used Ashdown ABM combo, it will give you an excellent gritty rock tone without having to rely on pedals. A Sansamp pedal (or the Behringer BDI21 knock off) will be useful too, either as an overdrive/booster, or for providing an amp like sound to the PA should you ever find yourself needing to play without an amp. Get a stage tuner pedal also so you can tune in silence! Best bang for buck are the Ibanez LU-20 or Artec tuners, or spend a bit more for a Korg Pitchblack or TC Polytune.