Speaker help under $2,500

Without knowing the amp, or at least the type of tube amp you will get, we can't give you meaningful suggestions. 8w class A SETs won't drive the same speakers as bigger KT150, EL34, etc.
The more specific you are about your preferences, the better the suggestions will be...cheers,
Spencer

Well, the most frequently match with A.R. gear is probably Vandersteen. Used the 3A or 4 both would fit your price range.

The Nola Contender used is worthy of consideration, and I believe they were voiced using Audio Research gear which is a favorite of the Nola team.

Two lesser known but good value options are Silverline Sonatas, which strangely have 3 pair on Agon now, and the Acoustic Zen Adagio.

Of course, listening if possible is always recommended, but geography often makes it tough to do. At least with  long-standing and well regarded brands like Vandersteen and Nola you won't be risking a lot if you decide that it's not what makes you happy.  Cheers,
Spencer