Honestly, I think the coil-overs will get you the best performance, but it really all depends on what you're looking for. The coil-overs, in conjunction with better sway bars, will give you better handling. I just put a Megan Racing rear sway on mine, & noticed the difference in the corners immediately.
I'm hoping to install the front one this coming weekend, as I'll have the following week off of work to get the alignment done. I just hope it fits, since MR says it's not for the 11th Gen Rollas. Anyone have any experience with this?