i was going to respond to your other post but i'll respond here. i have the third pair, and i think you should size up. i read on another board that those run small. i sized up one, since they don't have half sizes. the front part cuts into my skin a bit, but it's not anything that can't be solved with a band-aid. though if you size down it might be more of a problem.
I also have #3. I ordered a 7, normally wear a 7, and they are too big. I now really wish I had ordered down. Maybe each shoe is made differently though.
My friend has number 3 and they are very cute. They (3 and 4) also have slight heels and better soles, I was shocked when I saw hers and they weren't flimsy leather slipper soles (she also has 2, but said they were slightly more expensive and less comfortable, more like slippers with no support.) They are still not the best support, but I think you'd be better off with 3 or 4, though 1 and 2 are very cute.