Silverfish,
I suggest that you take your 7mm with. The Springs I felt, were cold enough that I was comfortable in my 7mm Henderson Hyperstretch. The Henderson Polartec/fleece is comfortable even in warm water and when it's a bit colder than I prefer, I wear my polartec under my 7mm. Full coverage is a comfort no matter what thickness you go with.
Good Luck and have fun!
I suggest that you take your 7mm with. The Springs I felt, were cold enough that I was comfortable in my 7mm Henderson Hyperstretch. The Henderson Polartec/fleece is comfortable even in warm water and when it's a bit colder than I prefer, I wear my polartec under my 7mm. Full coverage is a comfort no matter what thickness you go with.
Good Luck and have fun!