Good decision, if you're not sure you shouldn't be pre-ordering, especially if you don't have GP and have to pay full price. For me, I already have GP, have saved up enough MS rewards to get premium, and I'm definitely going to enjoy this, so I'm all ready for early access.
I also play GT7, but for me, it just doesn't click the way a Forza game does, namely the strange viewports available, and the sterile engine sounds (which are only marginally improved over the old vacuum recordings). Plus, my wheel setup is on PC now (have my SX downstairs on an OLED, PC on an ultrawide), and Forza works much better on an ultrawide monitor, plus excited to use my 3d printed button box with it