I've been doing further research on vendors, and have been most impressed with Gorilla Expense. Principals are ex-Concur. Anyone used Gorilla's products?
Concur's solution for interfacing with SAGE/MAS90 is not elegant, and puts too much burden on the buyer. Gorilla seems to have better integration and testing.
Thanks Often1 about Chrome River. I've been in contact with the firm and am still considering them, but their sales person was somewhat vague and less than persuasive.