Deflectors, I would get the 3M double-sided tape and install it myself. Did it for my previous rides and never had any issues with them. Removing it, it'll will take some work though.
Hood scoop, I wouldn't do it. I agree with what MightyMirageMpg said about that modification.
Mud flaps, definitely in plans for me as it would really help during the winter! Heck, I might even get those. I've seen somewhere on these forums about making these mudflaps fit.
Window tints, I'd pay the extra $100-150 for it to be professionally done. I had a previous car where the owner did the tint themselves and it was bubbling SO bad.
All around, you've got a good list. Keep us updated
View my fuel log 2015 Mirage DE 1.2 manual: 44.0 mpg (US) ... 18.7 km/L ... 5.3 L/100 km ... 52.9 mpg (Imp)