Well, welcome to the forum! Take time to give us and intro.
I just picked up my '12 SE MTX Foci WITH sport package a couple days ago. Been cruising around town, and LOVE how it handles. I honestly wouldn't even mess with the suspension for anything aftermarket. The only benefit would be to lower it. I would do the suspension on all of my imports, so my taste for a tight suspension is sufficiently meet by what comes with the sport package.
Springs on SE WITHOUT Sport Package
# BV61-5310-NG* Left Front Coil
# BV61-5310-NG* Right Front Coil
# BV61-5560-NG* Left Rear Coil Spring
# BV61-5560-NG* Right Rr Coil Spring
Springs on SE WITH Sport Package
# BV61-5310-NF* Left Front Coil
# BV61-5310-NF* Right Front Coil
# BV61-5560-NF* Left Rear Coil Spring
# BV61-5560-NF* Right Rr Coil Spring