It depends on the tone you want really, and there are several avenues you can follow.
A hotplate will help, but only if you like the tone the high volume gives you from the amp. The plate will keep the tone, but lessen the volume, and I don't think this is a route for you.
I always thought that a distirtion pedal in front of a distorted amp was just a mess, so my advice is to stay away from overdrive/distortion pedals, and just stay with an overdrive in that route, but in some cases it just pushes the gain and leaves the amp a little sterile. This may be a beeter altrnative in my opinion.
An eq pedal can rob tone if it is not tweaked right, and if it doesn't have enough tweak ability, but some have too much tweak ability and they suck too. :lol: They are nice, but can be a double-edged sword as well.
My advice would be to try out a few OD pedals and a few EQ pedals in tandem. That way you can drive the gain as needed, and tweak out the highs, lows, and mids with the EQ as you use them. Also you save a little cash to boot.

Just my thoughts for you here.