Spec'd Drops:
Mountune: 1.1" (Front) / 0.8" (Rear)
Eibach / Cobb: 0.8" (Front) / 0.7" (Rear)
I'm having Cobb's Sport Springs (i.e. rebranded Eibach's) installed on my 205/40-17x7 offset 42 wheels/tires this Saturday and will let you guys know if the drop is close to advertised spec...I don't know about Mountune's springs but in past experience with Eibach's they usually are very consistent with stated drop with little to no settling afterwards...
When considering going with a wider width or higher sidewall tire (205/45/17 or 215/40/17) wheel offset also needs to be carefully considered if you don't want rubbing to occur after lowering...With the Eibach's drop you shouldn't have any problems going with either size tire...Mountune's springs on the other hand may be questionable due to the lower front drop (1.1")...
I've found that this calculator below has always been very helpful when trying to get an idea how changing tire / wheel size will impact fitment after lowering....
http://www.rimsntires.com/specs0.jsp?item=Wheel-Tire size comparer&sw1=205&ar1=40&bd1=17&rw1=7.0&et1=47&sw2=205&ar2=40&bd2=17&rw2=7.0&et2=42&text1=Stock&text2=Sparco Assetta Gara