Bored?
Within my budget (lease/purchase and running costs) I doubt I can afford much more.
I have a need for a reasonably sized car and everything else is a plus.
The GTD is quick enough (more than so) for a bit of road legal fun. I don't need it to win races or be used as a ruler to measure my d*ck.
"True fun" (ie a car really worth doing some d*ck measuring with) is the things I see on Top Gear flying around the track for a top 10 laptime.
I'll never be able to afford that, so I don't even dream.
Even a "modest" jump to a M3 or lower end Porker isn't going happen before I retire, so I am happy with my Golf Mk7... its the best car I've ever owned/leased by a long way, pending my future Mk8.
Just putting some reality onto this thread 
I'm very much with you on that.
I often harp on about the best way to remember why you bought a Golf GTI/D/R or for that matter ANY Golf is to go and drive something else for a while.
As for the OP getting hung up on gadgets; you're always going to be on to a loser there. In the mk1 and mk2 days it took years for new electronics or anything else for that matter to appear but we're in another century now and there's a new electronic something or other out every second week. In fact right now with the Golf the latest gadget is the car itself in the form of the GTE.
A Golf is always going to be a little bit dull and dependable, VW spend millions making them that way for a reason.
Unfortunately if you have no children and no vices then you will always have surplus cash and will always be on a constant cycle of playing catch up (it's called too much time on your hands!

)
I have a colleague just the same. Her husband is a railway signalman and earns sh!t heaps of cash, she works full time in the office with me and they're always on some kind of trail of the latest gadgets which to be honest they never make the most of. Six months later they're hankering after whatever is new out (yes, the iWatch thingy seems to be the latest). Are they ever happy? I'll leave you to guess the answer.
fredgroves has it bang on.
How much performance can you have in a car
that you can use if you're not a weekend Santa Pod junkie or a trackday regular like a few of our members here. For a lot of people it's just smugness of having the best car in the range which if fair enough if that floats your boat.
I'm fairly lucky to work shift work so I can actually use my GTI on very quiet roads so can make the best of it and rather than getting bored of it after 18 months I actually like it more and more as I find out more and more what it can do (legally!).
Realistically you'd have more fun in a Fiesta 1.0 Ecoboost than an M3 and I regularly see a Ferrari running about locally cruising along with some young kid at the wheel making pops and 'engine noises' with a police car never far away from him. So yes, he's young and will attract attention and therefore can sit and be smug but can he use any of the car's performance?
I visited the R forum the other night when I was bored and they were arguing about a few tenths of a second to 60 mph difference between various gearboxes and tuning devices. Why not get out and enjoy the car instead of getting hung up on a few tenths of a second you'd never be able to tell in real time unless you have - yet another gadget!
Is an R the answer to the OP's requirements? I seriously doubt it as it has even less gadgets than a GTD (no park assist) and doesn't look as nice nor will it be appreciably quicker day to day.
I'm more with those that suggest getting a weekend toy that's not hung up on big BHP but instead puts you in touch with the road and the world outside and is FUN! So a Mazda MX5 would be my choice.