All clearomizers work with a wick, but if you aren't a fan of the types with long wicks, you could give BCCs a go (Bottom Coil Clearomizers). With the coil at the bottom, the wicks are really short and keep pulling the juice to the coil until the tank runs dry without needing to tilt. There are a lot of BCCs out there - a popular and highly recommended one is the Protank. There's also the Protank Mini which is smaller but looks better on Ego batteries. Another similarly praised one is the Evod.
Both feature replaceable heads which can be bought for a reasonable inexpensive price (around £2 each). It's literally a matter of unscrewing the head when it's done and screwing a new one in. These heads are rebuildable, but if you don't want to go down that route you don't have to!