New set of wheels. Tires and spacer advise

[Modified_f80]

Hey guys,

I recently got an amazing deal on the HRE's FF01 20x9 and 20x10.

I'm shopping for tires/ TPMS and wheel spacer.

I searched on the forums and I got confused so I decided to ask you guys for your opinion.

Tires would be Michelin Pilot Sport 4S front 265 30 20 and rears 285 30 20
Is this the widest I would be able to go?

I need a new set for the TPMS and I cant seem to find them. Any vendors here sells them?

Wheel spacer. 5mm in the front and 10mm in the back?
What brand of spacers and extended bolts should I go for?

With these new set of wheels I am debating on what set of coilovers/springs I should go with. As you already know, here in NJ we have so many pot holes and steep driveways. I really just wanted to drop about 1" in the front and leave the rear as is.

What would you guys recommend? KW Has? if so would it be funny to just swapping the back?

Opinions would be greatly appreciated.