Swift Springs drop around 1"-1.25". If you're looking to cover up some wheel gap on Stock 18" Wheels then you should be fine with either Eibach or Swifts since those are the two you listed. I barely had any wheel gap after I dropped my car on Swifts with stock 18s. When I switched to aftermarket 19" wheels I ended up with a 1" wheel gap all-around with 255/35/19 and 285/30/19 tires. I only needed a rear camber kit to bring my car within alignment specs. Did not need any rear toe bolts, just the arms. I'm not sure how much Eibach costs but Swifts are around $300 shipped. In my opinion I think they're worth it. The sheer number of Swift reviews prove it.
My 2 Cents.
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2011 Magnetic Black 370Z | K&N | BERK | SWIFT | SPC | AVANT GARDE
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