ScanXL looks pretty good.
I'm bouncing between just logging ability and full tuning.
EFI Live is a ton of $$, TunerCat and others are also big $$.
I don't mind spending if it turns into a long term use but for the short term I only need to see what is going on (logging)
i know once I see an issue I'll want to tweak it...
you know how that goes.

PS,
Uou really should buy your own computer, that kid is going to get sick of you borrowing his!