The deman cars sell quickly and at value + 80-90% of the deman mod cost. A 981 GT4.5 sells for 140/150 easy

I have Luxor beige in my 991 and it brightens the interior so much. Only issue is the glare of the dash reflecting onto the windshield which can be a pain without polarized sunglasses

Same

Buckets go up and down a little and front to back. You can also get aftermarket brackets that adjust the angle to make them a little easier on your back. I haven’t gotten them but I know some bigger guys who have said they work wonders

You can definitely test drive. I test drove GT3’s and RS’s of different varieties when I was searching. Go in, tell them your situation and the differences you’ve read about that you’d like to experience firsthand, and most dealerships/sellers will understand if you’re serious.