Epilog is a great engraver, but you are talking about $$,$$$. A buddy of mine got one of those cheap knock off engravers, $2000. It is okay, does it's job, but the software is limited. Most of these engravers and such you are paying for the software more than anything. Some of the advanced features are nice but not required. My buddies works for pens, but again, limited, he has no way to put on an attachment that rotates to give an even engraving, so if it is something like tall letters, the tops and bottoms are only slightly deep while the center is perfect.
Unless you sell tons of pens or are swimming in cash, it might be worth sending it to an engraver. Just my 2 cents.