All this what Stephen said^^^^^^^^^^ Try http://tirerack.com for a better deal + they're a sponsor here.There is only one style of rear coil overs for our car; spring and adjuster perch is separate from the shock (not enough room for true coilover strut.) For your year, you will need 06-11 coil overs. You can use 00-05 coil overs but will need to spend extra on a sleeve (Massive "Omni-kit") to fit the fronts (they redesigned the shock body, made it larger in '06 where it sits in the knuckle and the sleeve fills the extra space)
All front coilovers from 06-11 will look the same (most sites use stock images of generic coilovers) It is an adjustable coilover strut design. Mostly just decide if you want really good track handling or ability to go super low, then decide on price.
KW and H&R are made to handle well, stiff. ST is made by KW and uses galvanized steel over stainless to keep costs down, essentially Var1 otherwise. K-Sport's handle well enough but I wouldnt expect them to track as well as KW/H&R and will go really low. I'd plan to get adjustable camber/toe for the rear to dial in your allignment (your tires will thank you.)
Shift thread is 12mm x 1.25mm...also you can always use generic fit all ones that bolt on with an allen key or something
Glad to hear your not using those wheels w/ adapters. Thats just stupid if you thought about using those wheels.Id keep the wheels and get an adapter to go to 4x108 but it would push the wheels out way too far i think, 16x9 with zero offset stuck out quite a bit on the s series and it looks like the focus hub is a little closer to the outside of the body than the s series so that alone would push it out further. Looks like im gonna have to sell them which is fine i guess, i won them on instagram for free hahahah. It looks like wide low offset wheels are hard to come by in 4x108 for a reasonable ish price