I could be totally wrong but I have heard that the original pressings with the Bob Ludwig mastering sound pretty amazing. Not sure what those go for though.
https://www.discogs.com/Dire-Straits-Brothers-In-Arms/release/770027 I have this one. It's fantastic and I paid $5 or $10 for it at a local shop.
I think I also have a "club release" that came out in 1985 as well that sounds just fine. I'm sure the MOFI is great but you'll be happy. https://www.discogs.com/Dire-Straits-Brothers-In-Arms/release/4188172 I think the MASTERDISK stamp in the runout is the key.