1) I have those as my replacement OEM tires. I only use them for winter. They are really good in my opinion.
2)17x7 with stock tires should work according to this:
Tire Selection / Wheel Size Master Guide - TSXClub.com Forums
This link will answer any of your tires, offset questions.
3)Big no on underlights. That was early 2000's, late 90s! Tints are a great starter. Everyone has their opinion where you should start modding, and for me it's with suspension. I think a car giong for performance should be able to handle the road first. I'd go in this order.
well upgrade the basics first. Brakes, rotors and tires. Then
1) Springs/struts or coilovers
2) rear camber kit
3) rear sway bar
4) intake
5) hondata ecu reflash