Apex'i AVC-R
Nice bright screen, fits perfectly in ashtray area =) Ability to monitor up to four values, including speed, rpm, boost/vacuum, throttle position. Able to monitor those values as digital "dials" on the screen, numerically, or graph-wise, and can save and replay up to 20 seconds of those graphs. Able to hold 2 preset boost settings, and able to program boost in general, and also by rpm increments. Scramble boost settings allowed for each of 2 boost settings, but a button must be sourced independantly.
Only thing that gets slightly annoying, hard to see the screen in sunlight. Holds boost perfectly when set, no problems at all so far.
Whew, I'm out of breath =)