Actually, the B&W 703 is the most expensive speaker (MSRP US$3000/pair) in B&W's 700 Series product range. There is also an 800 Series and a Prestige/Signature Series (mostly discontinued) that are more expensive. The most expensive B&W speaker is the 4-way active Nautilus, shell shape, which has an MSRP of US$40,000/pair
The RBH
Titus speaker (MSRP US$50,000/pair) is well liked by Gene, the Audioholics website owner.
Audioholics has a partial
list of speaker manufacturers, but there are MANY more. Canton, Von Schweikert, Mordaunt Short, Monitor Audio, and on and on and on . . . Some of these products have been favorably reviewed by Audioholics; you can search the site to find the reviews.