rx-v665 vs sr5003

[reyz]

simple question: based on their specs, which one has a better bang for buck?
quality, cleanliness and clarity. would also like to hear the opinions on the character of the sound that is output from either, for anybody who has experience with either/both of these receivers?

also, if it would be possible, any comments on whether it'll be a good match with the following 5.1 boston acoustics set i have coming right up in a week's time:

CS-226 flstanding
CS-225CB centre
CS-23 surrounds
CS Sub 10 10" subwoofer

and on a sidenote, though this may sound like a stupid question: is the v665 definitely an improvement over the 663 in all areas? cos the salesguy i spoke to said its definitely a no-brainer and they're offering it at the same price as the 663. cos i've been hearing rave reviews about the 663 being a great entry-level receiver on the forums here, but no word or sight of a 665 anywhere..

thanks so much!