Here's a quick personal assesment of the compressors that you are considering plus a recommendation.
I own or have used all of these extensively.
You can't beat an 1176LN for an all around compressor.
It is a VERY versatile tool and I've probebly owned (or used daily) ten different ones!
The backface LNs are the quietest, but due to age they could maybe use a re-cap.
I had a blue stripe unit that I loved, too.
The later ones (suffix E onward?) have a differential amp instead of a transformer to convert the balanced input signal into an un-balanced signal.
There is a slight difference in sound due to the IC (a 3324) differential amp.
Because the 1178s were introduced after UREI went with the IC based differential input amp they have the 3324IC instead of a transformer.
It's not really a big deal though.
I personally didn't like the ADL unit.
I do like UA LA2s though.
Maybe it was the situation?
I wouldn't use an opto compressor on a stereo buss.
They color the sound too much IMO.
If you want to have a unit that works well as a stand alone compressor and is a great stereo buss compressor then get a Neve 33609!
I had a pair that I had to let go because they were mounted in a Neve 3128 console that was sold a package.... I miss it!
I had them AND two blackface 1176LNs and I used the 33609s more often.
Plus, 33609s are GREAT stereo buss compressors.
They are VERY versatile and they rock on rock stuff.
I don't know what the re-issues go for, but you should be able to get a used unit in the $2200.00 to $2400.00 range.
It would be money well spent!
You'd cover a lot of bases and have a very versatile piece.
I just mastered a project using two Neve 1073s, a GML 8200
and a 33609 and it just sounded so good!
For fun we tried an Alan Smart C2 and a Manley VariMu, but the 33609 won hands down.