The two way is pretty nice, I had one on my '89 325i and it beeps at you if the alarm is going off or the car started sucessfully etc. Had some pretty fancy features I never wired up, like trunk lid release and window motor control.
Thanks. Yeah, decided to go with that. I just set the install date. I got the 2-way for an extra $40. not bad. I didn't realize it was that low of an increase. $339 for everything done at my house. Not too bad.