What do you do if someone has your startup's twitter name?
xist: How important to the business plan is the twitter name?  
I dont think you will get it from twitter just because you want it.If twitter is vital to your business suceeding/marketing plan, then maybe something like  "splitthebilldotcom", to make it look "official".I see you asked twitter, but have you asked/received a response from the user yet?