I don't play heavy stuff, so this might not be as relevant, but I find that the best, most natural tone for a guitar is achieved with as few pedals, and signal processors as possible. Obviously a few are ok, but when people go overboard it tends to make the guitar sound tinny and just kind of "digital". There are exceptions and differing opinions, but that's what i hear. One of the best things that i realized when I started recording was how much the tone and volume control knobs on the guitar effect the output tone of the amp. It is noticeable in big leaps live (i.e. you'll notice a change if you drop the tone or volume 3 or 4 levels) but on a recording you can make a world of difference just by altering the sound by the smallest of changes (like turning up or down 1 or even half a level). Try experimenting with that first, along with the levels on your amp, and the placement of the mic (i get a fatter sound by putting the mic slightly off center about 2-3 inches away from the dust cap and angling it slightly inward). You might find that you can get the sound you are looking for without having to get new pedals. Just a thought though.