You should be fine just upgrading the pads,rotors, lines & fluid on the Akebono's as long as your not doing any repeated hard stops like on a track.
Z1 Motorsports
StopTech's will run you about $5,300 all 4
Rotora 6/4 14"/13" will run you about $3,500 all 4
Rotora 8/4 15"/15" will run you about $5,800 all 4
Upgrading to these brakes allow you to go longer without the brakes fading out on you. If you just drive on the street, these are a bit overkill. Don't get me wrong, they look downright badazz, but slowing down from 100mph is no different on a supercharged or n/a car. You might need bigger wheels to clear the calipers, so I would take that into consideration also.