I combine stuff at my job. Development and Management is split 50/50 a.t.m.

This of course might change to more management if that part of the jobs demands more time.

Nothing wrong with becoming a manager if that's your thing. But I love the fact that I can still do some research (/poc development).

As we say in Dutch: A Developer in Heart and Kidneys ;-)

edit:

Additionally, I think it might actually help in becoming a good manager if you are a good developer, still being able to 'relate' (i.e. not looking down from your ivory management tower).