How low do you want to go? We had the same thoughts with this before. and I ended up purchasing an Eibach Pro-Kit (http://www.ebay.ca/itm/Eibach-6048-140-Pro-Kit-Lowering-Springs-2008-2017-Mitsubishi-Lancer-DE-ES-GTS-/391772773831?hash=item5b377a1dc7:g:3k4AAOSwDiBZEJ~x&vxp=mtr). Lowest you can go for this is 1.2 Front/0.8 Rear drop. I chose this over the Eibach Sport Lines (http://www.ebay.ca/itm/Eibach-4-4860-Sportline-Kit-Set-Of-4-Springs-fit-Mitsubishi-Lancer-08-17-/131140722506?hash=item1e88989f4a:g:3fgAAOSwDuJW1cMp&vxp=mtr) which can give you 1.7 front/1.5 rear drop, since our winter roads here sucks and I daily my ride. Over the course of inquiring and doing a little research, I've read some articles that the Eibach pro-kits are more compatible with your OEM struts, but then again it all boils down to how you drive. If you really wanted to go with coilovers, BC Racing usually tops the charts with performance and ride quality (some may contradict with this), here's the link: http://www.ebay.ca/itm/BC-Racing-BR-FULL-Coilovers-SHOCKS-SPRINGS-KIT-FOR-2008-2016-Mitsubishi-Lancer-/112418279504?hash=item1a2ca6d050:g:S74AAOSwmkpZePQA&vxp=mtr. Cheapest coilovers with quality would be the Tein Street Basis http://www.ebay.ca/itm/TEIN-Street-Basis-Coilovers-02-07-MITSUBISHI-LANCER-CS6A-ES-/222537754992?hash=item33d048a970:g:plQAAOSwiOFZN616&vxp=mtr. If you drive on harsh winter roads and you have coils, I suggest that you get some ISC coilover covers to protect your dampering mechanism from salt and grime http://www.ebay.ca/itm/ISC-Suspension-370mm-Length-Coilover-Covers-pair-/381533554807?hash=item58d52c0877:g:vBsAAOSw--1Wq8ar&vxp=mtr.
Just take note that once you have changed your springs, no matter what the brand is, you will really expect a change in your car's ride quality especially when it comes to bumps since it will be more stiffer. Bonus with the coilovers is that you can always adjust ride height to your preference.
Hope this helps.