Thanks to everyone for your help.
I think I'm going to go with the MM full lengths.
I was reading reviews of subs in general and found a few possible problems. I believe it was the Steeda version where people were complaining of reduced ground clearance, and they were hitting on speed bumps, etc. Has anyone had this problem with the flat MM full lengths?
I saw something about the welding burning the carpet....has this happened to anyone here?
Also, are these visible at walking level? I see MM has a powdercoated black version for more $$ and it confused me...is that for rust protection or what?
Finally, it appears the subs will make the car feel more solid, improve handling, reduce noise, and make it last longer overall. I'm still a little worried about ride quality/comfort with all the worn roads around here...after you guys installed subs, did the ride feel rougher from the stiffness?