Need recommendation for Diagnostic tool
 

Hi guy's!
Got a Forester 06 with EJ204. I also got issues with AVCS and need a tool for among other things checking camshaft positioning live.
I understand that there is a bunch of systems out there, and I'm looking for a decent tool that can handle "all" issues, without me being bankrupted.
Please advice a few that can handle most parameters on the Subaru and preferrably other car makes as well. (standalone unit is preferrable) I'll try find those on Ebay.
Thanks in advance
/Thomas Z.