Did you have the TSB performed on your car for the front shocks at any point? If not, you'll need new springs as well if getting Bilsteins, as GM redesigned this after the 12/11 production month, which resulted in a lower spring perch and longer spring. You'll want to pick up front springs for a later VIN 2012+ or a 2013+ Eco as your front springs are too short. If you did have them replaced due to clunking noise early on, you'll have the new design.
The rear sway bar can be picked up on the BNR website, but be sure to review my tutorial first to ensure that your spring seats are the same as mine were or that sway bar may not fit. They had a different sway bar for early 2011 models that may or may not fit your car.
Bilstein B6 shocks are currently being ordered from Germany and take approximately 8-12 weeks to arrive. Be sure to factor that into your plans. It's a bit of a wait, but it's well worth it. I recommend ordering them from BNR: Bilstein B6 HD Shocks 2011-2016 Chevrolet Cruze
I wouldn't say I've had any exceptional experiences with Monroe. Due to a lack of options, I installed them on our 2011 Odyssey. It was either Monroe shocks for $94 apiece or OEM Honda shocks, which were worn out by 76k miles, for $325. I chose KYB for the rear.
For performance shocks, the only options I know of are Bilstein B6 HD or B8 (for lowered springs). Aside from that, you'd have to look at coilovers, which will cost even more and may ride worse.