T2 Theatrical Version on of the best Audio Option is, afaik, the oop japanese DVD in Full Bitrate DTS.
Regarding T1 Audio, there is already a thread discussing it:
The T1 remastered BD should be easily avaible at amazon.com
Nice Terminator 1 and theatrical 2 Project with great Audio options are discussed and presented here:
Discussions regarding T2 optically aree here also I think it cross over with the Audio thematic:
regarding T2 Audio Versions there is also a thread: