**LONG POST/PIC HEAVY**
Hey guys, looking to get some advice/direction with wheels/tires (I apologize if this is the wrong spot for it). This will be the first car I've swapped wheels on, and a lot of it is alien to me at this point, but I've done some research I think I have a pretty decent handle on what I need, just want to make sure I'm on the right track.
I have a 2012 3.6R with these wheels. http://i.imgur.com/ofyySks.jpg
Wheel-size.com tells me that the stock wheels/tires for a '12 3.6 is 215/50R17 on 17x7's with a 55 offset. Mine is on 225/50R17's for some reason, so I'm guessing the previous owner had them switched at some point. Here's a picture of my current poke (or lack of) as well.
http://i.imgur.com/gRP4Y5K.jpg
I've been using Wheelmax.com to browse and sample (great previewer on this site btw) to get an idea of what I like and how my car would look with them. I want to stick with 18's since this is my daily driver and I prefer functionality. I've settled on two wheels so far for both looks and pricepoint: Motegi Racing MR116's in Gloss Black w/ Machined Lip, and Enkei Sesto's in Gunmetal (though I'm leaning towards the Sesto's).
Motegi MR116
http://i.imgur.com/bkKv8KZ.png
Enkei Sesto
http://i.imgur.com/8Q0d506.png
The site says that the MR116's are 18x8 with a 45 offset, while the Sesto's are 18x7.5 with a 45 offset.
Using Willtheyfit.com to get the following measurements and I think I've figured out that 245/40/18's are a good fit tire to use for these without rubbing or needing to adjust the speedo (if not just slightly).
http://i.imgur.com/wUY6ucf.pnghttp://i.imgur.com/0PYUeyg.png
Did I do this correctly and will these fit? Should I maybe go down to 235's? Down to 35 profile? Or maybe up to 255's? Or 45 profile?
Additionally, if I plan on dropping my car at all in the future (probably no further than 1"), will both of these tires/wheel sets fit still or will I need to reconsider size?
Any and all help and advice is greatly appreciated. I've never done anything like this before and I want to make sure I do it right.