To get an in-yer-face sound you need an in-yer-face rig, i.e. something as SIMPLE as possible. Less knobs and features = more in-yer-face tone. Remember, that kind of sound is SO not born out of flexibility, presets and pre-programmed pre-delays on that 'Smoking Royal Albert Hall Plate'.
If you're just about happy with your live sound keep the digitech for now for it's flexibility (or trade it for a JMP-1 if you want a little of both worlds).
Then pick up ANY 50watt British style EL-34 head with NO master volume (Marshall, Orange, Nolan, Sound City, VOX AC50, Selmer etc etc) and use that in the studio with your Boogie 4X12" for a while and THEN make a definite decision about which way to go after that.
If it doesn't distort enough for you get a distortion/overdrive pedal (nothing digital.!!!) but remember to push the amp and not rely on the pedal for tone.
It'll be noisy as heck, you'll find out things about your playing and touch that you never knew (and probably never wanted to know) but I bet you it'll sound more edgy, aggressive and in-yer-face than ANY rack preamp/poweramp combination. And I wager that after a period of adjusting YOU will sound a lot more on it and assertive in your playing and possibly at that stage ditch the Digitech (or JMP) for its touch as much as its tone.
YMMV - but I don't think it will
