Dullonien I have to slightly disagree with you on somethings, I think the packs are both equally equipped and well Warburton will argubally have 1 of the biggest tests in his test career containing an on-form O'Brien and well Ferris is in magical form.
While you mention Wales may target O'Gara, facts show O'Gara delivers more often when he is the one targeted. But the added bonus now is O'Gara is probably in some of the best form he has ever shown in a green jersey, and well if he doesn't start then we have Sexton who is in great form and well I think his poor goal-kicking has overshadowed his good form in the other areas of his game.
In the back's D'Arcy and BOD will be a match for anyone and well Wales back 3 are in good form but are up against a back 3 that are just as dangerous.
And well you talk about bench options but while you mentioned a possible Welsh bench with a few returning from injury Ireland have a bench who are on form also and can contribute.
Same can be said of O'Brien, can he contain Warburton at the breakdown? Ferris is in great form aswell, but so are Lydiate and Faletau, Ryan Jones aint too bad either.
I was talking about O'Gara's defense, there's every opportunity Wales will cause havok running through O'Gara. North has been used to very good effect attacking the 10 channel in the pool games, and I can see it continue. Afterall, the Irish backrow will have their hands full keeping the Welsh backrow quiet, and the Irish centres have a little thing called Jamie Roberts to worry about, as well as Hook/Williams/Davies. I'm not sure Ireland can babysit O'Gara like they used to when Wallace would cover for him defensively, but we'll wait and see. It's a pitty Sexton is struggling with the boot at the mo, I feel he's a much better player than O'Gara in most other aspects of the game, especially defensively.
I still don't think D'Arcy and O'Driscoll have been playing all that well this world cup. They've been solid and steady, but nothing special. O'Driscoll still has his moments, but his presence is waning slightly (especially at the breakdown after the rule change). D'Arcy has only just got some sort of form back, but that could disappear again easily. As for the back three, Bowe is good, but at this moment in time North is better. He's stronger, faster and has better feet, his support play has also been second to none. Earls and Halpenny are about equal, as are Byrne and Kearney (both returning from injury problems and poor form).
I still feel Wales' bench will be far superiour. Trimble is no match for Shane/Halfpenny. Sexton is a good option, but out of form with the boot, which is a big deal imo. We have a quality centre, or two in reserve. Our backup prop is of a very high quality who has been doing great in Gethins absense, and Bradley is another top performer despite a slight dip of form. Then there's our former Captain. Lloyd Burns is possibly the real weak link, but even he had a great game today! I don't think Irelands bench quite stacks up in comparision. But I'm probably making too big a deal of it anyway.