Sure if you have 2500 versus 650.
??? Costs? For less than $1600 I have coilovers, megan racing rear camber arms, install and alignment...and no worries about bump stops, shocks going to junk, height or ride issues.
Think that is pretty reasonable...not spending $1800 for MPP or UPP just to have their fairy dust sprinkled solution on my car when all the above does the same I need it to for less.
Springs are going to run you more than $650....$350+ for spring install around where I live, compared to $550 for coilovers...and alignment is whatever, needs to be done whatever, so you are really only about oh....$700 more in my estimate for a few off brand coilovers to get way more for your money and avoid all the issues and problems with just springs. I know it is the cheap way to lower your car and get a "better" ride...but as soon as you are on a reasonable set of descent coilovers, and can set the height exactly where you want, and can control dampening...it is a big difference worth the extra money.
Money no object, buy whatever coilover you want, MPP/KW or whatever if you are tracking the car. Waste otherwise for street use for 99% of people IMO. want. But it can be done for way less than $2500, few of us have very good results with some off brands like Riaction or Megan racing coilovers. Rest of stories on here from naysayers is all hearsay about you get what you pay for on coilovers...sure..conjecture and no proof or first hand experience otherwise.
But do what you want. Springs are a temp fix and might hold you over the life you own the car....or shocks might blow, ride height and other issues could pop up..who knows. Chance you take modding any car for that matter.