I'm partial to the Bryston myself. It's hard to beat the
build quality and reliability of the Bryston amplifiers. 20
year warranty!! I upgraded from 4B to 7BST's, and I'm ecstatic about them. I'm kind of biased, but I'd go for the
Bryston 4BST. Besides, in the unlikely event that you don't
like the 4BST, you'll be able to sell it easily. Although I
haven't heard the other two amplifiers, from what I've heard, the Aragon would be a close second, and the Parasound
a distant third. Hope you find what you're looking for.