I think you're asking the wrong question entirely. Whatever language you use should not depend on the size of your team; I've seen several small teams (3-5 people) implement very impressive JavaEE applications. I've also seen large task forces using Perl and Python.
What are you designing, and which language best suits your needs?? You already specified 2 potential requirements: no dynamism and speed -- what other requirements do you have? Does your application include string-parsing? If so, you might need a language with decent Regular Expression support. Will your application run on more than one architecture? If so, you might consider Java (please, no comments about whether or not this is a good idea -- I'm simply making a point). Are you concerned with memory management? These are questions you need to consider when picking a language; the size of your team will not have much bearing on your decision.
Ultimately, the language is simply a means to an end -- it's a tool (as @rockin mentioned). It's up to you and your team to decide what tools you know, their strengths and weaknesses per your project requirements, and how they might best serve your purposes.