I think the absolutely base model RBL 20 from CSM was only $2450 if PIF at time of order. That would be a DT/splinter, straight or PG/ejectors/14.25" or 14.75"(?) LOP configuration with French gray frame, 28" bbls and choke tubes. Heckuva deal if you could find one of those.
You might also look for a Miroku or Daly (not Browning) SxS in 20 gauge. The Miroku/Daly labels don't command the same price premium that the BSS's do, and give you DT/splinter/extractor choices, sometimes better engraving, and often lighter weight. They all came out of the same factory. I bought a Miroku 20 last year for $950 (I think) and it compares very favorably to my BSS Sporters and my RBL 20. Not as pretty as the RBL, but handles as well.
You could also look for second tier Spanish guns such as Armas Erbi (now out of business as far as I know); a bit risky but you could score a real deal. Ugartecheas are underappreciated, and the Aspen Outfitting version sold as the AOC/SG is very nice and well regarded (see Weiland's "Spanish Best"); sometimes seen in the $1900 to $2700 range ANIB. For $2500 you should also be able to find an absolutely mint AyA 4/53. With luck and diligence, you could even find a nice Parker VH 20 or Fox Sterlingworth 20.
Have fun looking.
