Well, if I were in your shoes willing to take a financial hit my reasons would be:
1. Suspension- I drive an R, but I recently drove my gf's gti with DG springs and absolutely love the handling. It's fun!
2. Brakes- the GTI brakes are much better than the 2.5 (although other cars in the class have better stock braking, they are still pretty sand good for DD, if you track you may want to upgrade).
3. Turbo engine- very tunable and, as you said, even stock it's a blast.
4. Transmission- DSG is loved by many and I respect it for what it is, and 6MT has a very easy clutch and shifting is prob more fun than 5speed golf.
5. Seats- i assume your seats are the same as the TDI seats which I test drove and, frankly, the GTI seats (cloth or leather) are a some of the best stock seats I've ever sat in. Worlds above the 2.5 golf.
6. Style- this is personal pref, but if you like the more aggressive look of the GTI then this is a good reason since body kits aren't cheap. Interior there is leather options and the plaid looks cool IMHO.
7. Steering wheel- the GTI has the best steering wheel I have ever laid hands on. Period. There is a top ten list that includes mostly cars that I'll never touch in my lifetime, but yeah, the GTI steering is up there with cars 4x it's price.
8. Made in Germany.
That said, I do not abide with trading in a relatively new golf because of the loss you'll take on it. This is a very hypocritical thing for me to say because I took a haircut trading in a 12 GTI for 12 R. However, in my case, I could comfortably do so without sacrificing anything or jeapordizing anything other than my 5 year plan to be a full time ski bum. Now it's a 6 year plan
Edit: btw- this whole thread is flawed... You'll never get an unbiased opinion here:laugh: