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:
http://originaltrilogy.com/topic/The-Terminator-1984-Original-Theatrical-Mono-Preservation/id/15807
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:
http://originaltrilogy.com/topic/Terminator-1-and-2-Projects/id/17330
Discussions regarding T2 optically aree here also I think it cross over with the Audio thematic:
http://originaltrilogy.com/topic/The-Look-of-Terminator-2/id/17850/page/1
regarding T2 Audio Versions there is also a thread:
http://originaltrilogy.com/topic/Terminator-2-in-search-of-the-theatrical-sound-mix/id/15340