I have a brand new set of FE5's I still have to install and I got a package deal from crateenginedepot.com their cost was $339 out the door and got to my house in about 6 days
Still need to order the moog endlinks since my OEMs are a bit worn. I would suggest getting the FE5's if you want to upgrade your struts/shocks, heard nothing but good things about them compared to the baseline replacements.
At the 100k mark is about the lifespan of the AC Delco spark plugs, I believe GM uses iridium, I have not looked since I replaced mine at 50k mileage. I went with Nippon Denso Iridiums. Have not had an issue yet, but spark plugs are a must at 100k if haven't been replaced yet. There are a few others too, like trans fluid flush, radiator flush, timing chain inspection/adjustment, etc.
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