A nice healthy bit of debate going on in here at last! It's been soooo dull and friendly for soooo long!!!

I'm not sure I agree with your earlier comment about saying you might as well buy a GTD if you don't spec the performance pack Exonian! What kind of logic is that?! I don't want a petrol vs diesel debate, but I just prefer the smoothness of petrol engines, and I prefer the looks of the GTI over the GTD in terms of wheels, red accents, and interior. There is more to a car than just performance, and £1000 extra for just 8 seconds gain around the Nurb simply isn't worth it for every day use in my view.
Yep, it's an expensive option on an already reasonably expensive car. Most people in the market for a GTI are not after a car that that they want to drive like they are on a track. Of those who do go for the performance pack, I suspect very few will actually be able to truly appreciate the difference, but just go for it for pub talk. Personally, I've never had an issue with the brakes on my MkV GTI, even fully-loaded, but then again, in such a state I wouldn't drive it like I'm around Brands Hatch!
You'll get used to me Graham but most of my posts are a bit tongue in cheek as I've been doing internet forums for many many years and just see time and again people taking the words they read very literally and you will get a bit of misunderstanding that leads to a massive online row. All good fun!! I do try and inject a bit of humour in and don't take much seriously.
I have a mate who sort of dates a lady via text messages and email and all they ever do is fall out as words get misinterpreted and misunderstandings turn into fall outs. Stick 'em in the room together and they get on just fine. It's a bit like that with forums. I used to do a lot of VW shows back in the 80s and 90s and met loads of great people. I'd fall out and argue to toss with them online I reckon but once you speak to them face to face you find that the differing opinions are not actually as marked as they look in print.
BUT I will say this, never underestimate the flexibility and performance of the modern Diesels. I drive them a lot and I'll side with the Diesel boys 75% of the time.
Back in 2008 I won a set of Koni FSD shocks for my mk5 GTI in VW Driver mag. I met Neil Birkett in rural Somerset for some action shots on country roads. I was driving a 240bhp modified mk5 GTI with Koni shocks and he had a standard 105 bhp Golf Plus TDI he had on road test. Now he's a much much better driver than me and I had another 135 bhp. Could I keep up with him? Nope! The TDI is made for give and take driving and a very fast cross country car. Just see what a lot of motoring journos will tell you off the record what cars they would personally buy - not the ones that you think would spring to mind!! The photo shoot is in the October or Nov 2008 VW Driver mag is anyone is in the slightest bit interested.
All I can say it that the mk7 GTI is the first one I've been willing to buy new as it's the first one that I'd be happy to own as a bog standard car since the mk2 GTI 8V. VW have got the spec vs cost about right I think. The Leon Cupra will prove me wrong on that score.
Just look at the Golf R cabrio, you get a peasant spec radio on a £40K car!! Just so wrong!!!
I aim to keep the mk7 for a lot longer than I normally keep my GTIs for and thus the massive depreciation will have to be swallowed and the PP will be beneficial to me as once the car is a few years old I will remap it and thus the diff and brakes will be very useful.
And don't assume because I've just said that I'm a boy racer as I'm not, I was 45 yesterday. I bought my first GTI in 1987 and have had many since. The reason GTIs have a cult following is that they are very balanced as standard but can be improved upon a little without upsetting that balance too much (ignoring the mk3 and 4 which were rubbish as standard and the reason SEAT became such a threat to VW for years). The PP has been put there by VW because they are very aware of the massive aftermarket industry and cult following of lightly modified GTIs, their chance at last to cash in on it and very beneficial to owners to have factory approved and properly engineered and tested modifications.
If I was going to buy the (quite well specced) standard car I do honestly think I'd plump for a GTD and just add a tuning box at a later date.