A lot of people on here use various brands of springs, some use Powell, some use ZZP, some use Eibach, etc. I've had no complaints so far on my Tein's so far, best wheel gap coverage i have seen are the Powell springs, it goes to maybe 1/4" below the top of wheel tread, so it sits somewhere around 2.25" or so.
For FE5's, Crate Engine Depot or Rock Auto has the cheapest prices for the shock/strut combo. I went with CED and paid $350 for the combo. Springs ran me $190. I changed out all the components that make up the rest of your strut with Moog products (better quality of OEM components). Altogether, mine ran about $800 roughly for all. Handles very well IMO.
If your trying to reduce body roll/sway, then you will need to get what I am shopping for of the month, sway bars. I have the rear sway bar by Powell (1.25 version) and ordering a LNF (OEM) front sway bar next week. Then change out the bushings from Prothane.
2009 Cobalt LS XFE U74
Mods: K&N Typhoon Intake, Option Cat-Back Exhaust, Cosmo Short shifter, Maxxim Ahead 17X7's, MPx shorty antenna, FE5 Strut/shocks, Tein S Techs, Moog endlinks, Moog spring seaters, ZZP shorty header, LSJ downpipe, LNF front grille