I tend to tweak magic items enough such that they are different from what's in the DMG, because I find most of those items boring and overused (everyone wants a vest of endurance, for instance. They are practically standard issue in some campaigns). For example, in my current campaign the bard doesn't wield a boring old +2 whip, but The Coils of Dauntan, a +1 whip that can--once per day--initiate a grapple as a free action and, if it gets a hold, can constrict for 2d6 damage per round for 1d4 rounds. Instead of gauntlets of ogre power, the fighter has gauntlets of gripping potency, which in addtion to giving him +2 strength, add +10 to all rolls to resist being disarmed. In this way I personalize magic items in my campaigns so that I don't get bored and my players don't feel they need to fill up their "paper doll" with boring old cloaks of resistance, vests of endurance, and +1 shields.