Dicks86

The stock seats in my 2017 BRZ are superb - supportive and comfortable.  I've no idea whether different models, Toyota/Subaru or model years have seen the seats change in design.

Stock seats are sufficient. You can't really get "comfy" bucket seats.. Let me put it this way, bucket seats will be alright for daily driving as long as you don't travel long distances, but you'll have to sacrifice some level of comfort if you want to be strapped in the seat.. unless you spend a lot of time on the track, it's not really worth it imho.
Then obviously a reasonable recommendation would be Corbeau seats.. or Recaro / Bride that you can get through us. 

Corbeau club sports, cheap and comfy. Not sure why people say they are uncomfortable on long journeys.. travelled 3-4+ hours in mine and been absolutely fine. Same with my dads pole positions 

Good bits for bucket seats - they have better side supports & usually weight less.
Cons - most of them are expensive, lack extras (such as heating or seating sensors for airbags), lack adjustment (and ease of adjustment if there is limited adjustment), limit visibility (especially with extra head protectors), limit ease of getting in rear for 2 door cars, way less comfortable to get in-out, may hamper proper working of stock safety belt and airbags (especially side ones). Also in some countries they might be non legal mod for car driven on public roads (mostly because not working well with stock safety mechanisms like airbags/belts and due lack of adjustment, which is also needed for safety mechanisms to work right).
Thus one has to choose according one's priorities. For example, if you track often and don't want to get bruises on knees anymore from pressing legs onto door/mid console while cornering hard, bucket seats are nice thing to have. Limited visibility might be worked around with not getting one with those head side supports. Lack of adjustment might matter less if you get seat that fits just right for you and you are the only one driving. Airbags can be switched off. Multipoint belts can be installed further better securing one in seat (but also more difficult to buckle/unbuckle for generic dailydriving).
But if you only daily drive .. or at most go to 2-5 track days per year at most and at easy pace on not too grippy tires .. imho best to stick with stock seats and enjoy their ease of generic use, and suffer through slight inconvenience at those rare track occasions
There is no seat option to get best of both without sacrificing something and compromising nothing. And imho not worth finding some half-assed interim compromise of jack-of-all-trades-master-of-none type.

What do you want from your car, road or track? when it comes to modding it opens up a whole world of expense. If it is for the road then a remap with a manifold is a great mod as it cures the problems we have in the lower rev range and it doesn't require any more supporting mods. If you are tracking the car then remap and mani is not so important... spend your money on track days. Turbo for the road imo is a waste of time as we spend most of our drives stuck in traffic. For the track a turbo would be great but then you would need additional oil cooling, better brakes... the list goes on. If I want to feel the power then I jump on my motorbike, 0-60 in 3 seconds although I doubt that I have even got close to that, bloody fast all the same. However @rob275 has a supercharger for sale at the right money