![](http://www.avatarspeakers.com/pictures/vintage%20112.jpg)
I suggest that you add a second cabinet to your Marshall. I am familiar with that amp. The V30 is known to be warmer sounding and have more low-end response. With that in a bottom cabinet near the floor you have plenty of low-end.
I suggest you go to the Avatar Speakers web site. Dave and company build guitar and bass cabinets exclusively. Price is low and build quality is very high. You can get a "vintage" style cab from him that will look nice with your Marshall. He builds several styles. Ask Dave to recommend a speaker that will get you what you are looking for. Look at his web site and you'll see that he has his own amps and cab combinations that he has assembled to verify the resulting tonality.
As far as pedals, check out The Tone Factor. Brad Fee has the world's largest variety of pedals. He's an encyclopedia of pedal knowledge and how to get a particular tone. http://www.tonefactor.com/