554life

what is a good style that complements Hapkido training? and why?

hello there, i'm looking for information about adding additional arts. Such as when to train in another, why, how long. there are so many that interest me now that i've been into it. I've started hapkido and find it truely rewarding, but i aslo want to crosstrain in somthing else, and form the looks of it, alot of people in these forms appear to do the same. jack of all trades, master of none.. Whats the idea behind the pros and cons, any help with links would help out...thanks