For reference - here are some pics of the different front lip setups I've had on my car:
3D Design
good clearance, a bit more aggressive than m-performance, close to OEM
Vorstiener GTS
love the design, not enough clearance especially if lowered, I cracked mine within 2 days 
M Performance with CF Splitters
OEM+, generous clearance, perfect setup for daily driving but not as aggressive as other aftermarket lips
RKP GTS Lip with CF Lower Splitter in Acid Orange
love this setup, was able to pull off that M3 GTS look, lower splitter is adjustable and customizable, low clearance especially with lower splitter installed
RKP GTS Lip without Lower Splitter
RKP GTS Lip with Lower Splitter in Frozen Moonstone
RSC Front Air Dam without Lower Splitter
aggressive setup, one of the strongest lips I've owned. engineered to maximize downforce, decent clearance but sticks out more, cracked mine as I miscalculated a ramp
PSM Front Lip
love the design as it contours to the lines of the F80, surprised to have decent ground clearance even with the lower splitter attached - obviously, with splitter attached, it will stick out more and will be more susceptible to breaking
PSM Front Lip with CF Lower Splitter
