...Your review (at least the first part of it) is either very biased toward Fanatec or their wheel must really be a very long way ahead of the G27......
I suggest 'looking into' a Carrera Wheel, as I have not tried one, I would imagine it has the same problems of the Logitech in that it is geared not belt driven, however if It's forcefeedback as at least as good as the G27 (presumptuous) given the added benefits of the Fanatec HUD and the tweaks you can apply via that then I would pick the Carrera probably, but It's speculative hence why you should look into it as It's a very good price including pedals and H shifter
The GT3RS comes in several bundles the Clubsport bundles comes with H pattern and Sequential Shifters, I would personally buy the one without shifters/wait till they release the Clubsport Shifter which will be metal construction if you are serious about getting a good shifter, again presumptuous that it will be any good, from the specs it will be a premium priced shifter like the clubsport pedals are premium. The ClubSport bundle also comes with the CS Metal Pedals which while expensive are worth it too, you can get the GT3RS cheaper without the expensive pedals and get the pedals later on if you were unsure. And with an Adapter you can use your G25/G27 pedals with it. You do get a discount buying them all together in one bundle though
The Fanatec noise in that video is as I'm turning it very quickly so noise of belt running round is about the same if not a bit quieter than the G27, the noise from the Logitech comes from the wheel gears as you change direction or force is suddenly applied or jerked and it is very noisy then, I should take a video of it playing Dirt with the FFB maxed but I didnt have time to go into much detail with the Logitech. Changing direction or rumble makes almost no additional noise on the Fanatec omitting the mechanical jolt the Logitech has when changing direction or force.
The noise isn't the big deal though albeit annoying, It's the mechanical jarring sensation; for me it kills the immersion; less to no deal in smooth racing games, but in off road It's a deal breaker
The G27 is quieter than the G25 from reports as the gears are smoother/helical
I often have rumble/vibration effects set above maximum(hacked) and dampening entirely removed when playing off road games especially, and it causes havoc with the Logitech, not many people are as stupid as me setting the FFB so high, but I enjoy it :-D even though I'm probably knackering the parts quicker :-) it almost makes up for me not having a motion rig by getting the rumble thru the wheel even if that overshadows some of the wheel feedback, It's fun!
If you don't have a problem with the G25 being noisy or notchy then I doubt you will gain much from the Fanatec other than the HUD Tweaking (which I think is superb) and aesthetics and perhaps a bit stronger force, as you will likely be able to use both the Club Sport Pedals and Club Sport Shifter (when it comes out) with your Logitech G25 or any wheel on PC but not on the PS3
God I do ramble,