Which Certificate will help me later?

I am currently working with Java and would like to improve my knowledge and take it further. But I am unsure which direction to follow.

I thought that doing the Sun courses may help me develop my career, but which of the certificates do businesses actually look for? In my current line of work I only get to wrk with the J2SE system, and have been able to do almost everything in the SCJP program.

I want to learn something new, which will help me with career prospects. Does anyone have any information on what employers are looking for and whether a Sun Certificate can actually help me.