Great minds think alike. I've just bought an a100 for the exact same purpose. I'm stuck on the problem of phone call integration. Since I cannot pair my tablet to my phone as a handsfree device, there is no way to interrupt my music with an incoming call or take the call over the car speakers and microphone.
Official ICS for the a100 drops on April 27!
SGH-T889, rooted, CWM, debloated stock ROM
SGH-i897 build 1105, LANIGHT v6.5, Devil Kernel, Voodoo App (Backup)
HTC Aria CM7 (AT&T, sold)
HTC Wildfire(Bee) rooted, no ROMs (Alltel, sold)
HTC Touch Diamond CM 6.1 (WinMo, Alltel, sold)