I'm not sure that sonically there is a whole lot of difference. I was always under the impression that the largest difference between the two was that the 25 had a remote, a simple one mind you, and the 20 didn't.
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If you are seriously considering one of those ,look into the SP2 from Bryston . It is a 5.1 processor . It has the newest bp26 in it . I was looking at the bp20 and 25 and found the used prices to be around $1000 - $1200 used . I picked up the SP2 for $1300 . so for $100 i got the current bp 26 in the sp2 for almost the same price . And i am using it for home theater as well . Never heard a better pre yet .