Really there is no such thing as the perfect spec or setup.
Technology is always changing so todays cutting edge will probably be improved in the following months or years.
Lets face it, if you could afford it, wouldnt you keep trying to upgrade your car? If you won the lottery tomorrow, wouldnt you spend a chunk of it trying to create the ultimate car?.
Unfortunately most of us are on a budget. Some of us have more, some have less. But we all try to get the most of what we have.
Fortunately we are all starting from a great base as even the standard car is a match for most modern cars this side of 50k. Spend a few thousand and you will match anything up to 100k!
There is no right and no wrong. Everyone has a budget and everyone has a preferred driving style. All I know is we have a great car wether it be a streetcar at 400 bhp or a drag monster at 1000.