A PRS SE Soapbar II. It can do anything. I thought it was so nice, I bought it twice. (Its price has gone up a fair amount over the last few years though)
For me the big two are a tele and something full hollow. After that, it's a collection not a "need", and I'd go for just about anything cool. I did just buy an LP-kinda sorta guitar that I look forward to gigging in a few weeks.