Actron cp9150 kit. It does basics on OBDI and II, plus has all of the cables and power access supplies ya need. That'* because the extended family has an OBDI Ford, OBDI Chrysler, my wheels are the hybrid application OBDI and II, and I'm looking for a 97-99 Bonneville DD for Toolgirl. So it'* more multipurpose.
If I had an OBDII car, and was interested in performance tuning.... that Autotap with a PDA seems like it would be a Killer App. I'm not there yet.
OT comment because I don't want to drive thread off of topic but.... over to general chat for an opinion as to why you should have a scantool when you are looking to buy a car.
1995 SE ..Green and Rattle Can...234K mi...Bonnie (she'll outlive me)
1998 SSEI .. White ..119K mi...Evey
1996 SSE ..MajTeal..157K mi...4/12- Dealer trade full of Lucas Trans fix