either of those is gonna be huge. I'd suggest the small (5") or the extra small (3.5")
I've only ever tried the x-small mr limpy and a 4 inch sailor packer, but i definitely wouldn't go any bigger than 5 inches. In my personal experience, the x small mr limpy sticks out and makes a bit of an awkward bulge, so If i were you id go with 5 inch mr limpy. If you got a little more money to blow, the sailor packer has a much more realistic feel to it.