Could nayone recommend a managed VPS that support/manage tomcat/JSP well?
I don;t think powervps do this, so need to ask around
What do you mean that supports/manages tomcate/JSP? Any VPS where you get root access should be able to handle Tomcat/JSP.
As far as the company specifically offering one-on-one support with Tomicat/JSP.. that is another story which you will most likely need to email specific companies and/or submit a Request for a quote on something like hostvoice.com.