I think that RW has the big-play potential that the great ones have, and the good ones lack. I can't believe that you're telling me, after seeing both guys play in three games, that you really think that Roy Williams and Larry Fitzgerald are comperable when it comes to the ability to get open. Roy Williams pretty obviously has more ability after the catch, which separates the men from those merely possessing X-Y Chromosomes.
Can you "get a speed reciever anywhere"? Scare one up for me right now. I don't see one on this roster, except for maybe Bryant Johnson, who isn't getting thrown to. On the other hand, I see four or five WRs on the roster who can probably do the exact same thing that Larry Fitzgerlad is doing. Honestly, I think that Larry's hands are being totally overrated here. C'mon, hands? Darrell Jackson and Koren Robinson dropped tons of balls last season, but their team made the playoffs. Why? Because they're big play threats.
If you've seen Roy Williams so far this season, I don't know how you can say that he's lacking in the hands department. If it's a choice between 85% hands and 95% speed (Williams) and 95% hands and 85% speed (Fitzgerald), I'd take the speed. You can't teach speed, but there are tons of ways to help with the hands.