No reason not to acquire a good 9mm, you may want something smaller to carry concealed. The Kahr 9mm is good choice.
Advice for a new gunner : Don't sell any of your guns, not for a few years, anyway. And do pick up a reloading outfit as soon as you can, you will be money ahead for decades to come. Do save all your brass, and collect what you can from others, whether you get a reload outfit or not.