If you don't think that bows of recent (that is, the past 5 years or so) will better your shooting performance in every way, then you're lying to yourself.
TroopA,
I don't think the issue in this thread, is modern vs. outdated bows. We have been talking about speed vs what you give up to get it. Assume we're talking about a brand new '05 bow. For instance, I could take my brand new bow, with 8.5" brace, and shoot 800 grains arrows out of it at 60 lbs. I could get an absolutely perfect arrow flight and a super quiet shot, but one thing I won't get is great speed - and I wouldn't care even a little bit.