Well it is all down to personal taste, The Sherman!
I know of guys who were totally put off by my gazongas..they prefer 2 asprins on an ironing board ;o)
As Greedyfly says, toned is good..but then I don't mind a bit of flab either! but as for really big muscles? no way. You are right in the view that a lot of women will go for the strong type, but the same could be said for me going for women with big hips..it isn't always so. Look at all those guys who fancy the likes of Keira Knightly or Vanessa Paradis.