I ordered the size 10-11 and use 2mm socks with them. Havent had any issues with the sizing, they work for me with and without the socks and I have a pretty average foot. The nice thing about the makos is being able to change the blades - If you decide to go with the plastic blades first and then choose to upgrade to fiberglass blades you can save yourself some coin for starters. I prefer the plastic since I work on a dive boat and I can beat on them a little bit more then I would if I had fiberglass blades. I also bounce back and forth between shallow freediving and SCUBA and they work great for both applications. You can also pick up fin keepers -
http://www.makospearguns.com/product-p/mfdfk.htm and use them if you plan on diving without socks and they will help with keeping your fins more secure. I have them myself and use them when I dont wear socks.