I use an AEM AQ1, I can log 8 channels plus it has a CAN to BUS input.
I log the following:
Fuel Pressure
Oil Pressure
Crank Case Vacuum
Oil Temp
Trans Oil Temp
Drive Line Speed
RPM
G-Force
Trans Brake Release
On the CAN to BUS the following:
AFR Right/Left
8 EGT's

I did it for way less than RacePak