The Omni or AMS 4 bar MAP sensor are the way to go. We've been tuning cars with a MAF/MAP hybrid via ECUTek for several months now. Sebastian at SpecialtyZ has it very dialed in. Your tuner will need to re-calibrate the MAP sensor once installed. I have a link to our site featuring the AMS MAP sensor and calibration chart.
AMS 4 Bar Map Sensor
-Tony