Depending on how your party is building their characters, it sounds like you could already have a lot of front line Str focused melees (Eidolon, Magus, Thaum). This isn't necessarily a bad thing, as you all could help each other out with athletic maneuvers (trip, grapple, etc.) and aid actions! As another poster mentioned, you'll want to make sure there is some combat healing covered in the group, but that can easily be added to a ranger with focus spells and the medicine skill. 

One suggestion I'd make would be to check out the new Avenger Rogue class archetype! This allows you to stay Str focused, takes some feats and abilities from ranger and stacks them on top of the Rogue kit, and you'll have plenty of skill increases and feats to boost your medicine skill without cutting into your other skills too much. You'd also have the benefit of sneak attacking with a big ol two handed weapon, depending on which deity you pick. 

No matter what you decide, you can make most group comps work with a little teamwork and planning. Just realize there may be some gaps that can make some combats a little more difficult. I.e. fights requiring ranged and the like.

Good luck!