Yes, Gav's right, if we only get 6 entries, I think it will be fine if some people want to enter two guitars. However, if we get more than 8, then I would encourage people to consider entering just the one. SO, pick one to enter and, if we are short, chuck the other one into the mix.
Also, you might want to wait to hear who the judge is. For instance, this month we're hoping for a big name from mid 90's US Rock/Metal, so you might want to tailor your entry to suit that style.