There are a lot of options. I have a Turbot, two samsungs, and a couple of slow chargers. The Samsungs are the only ones I won't pay for again. They are definitely nicer built, but don't work any better than even the $15 or $20 ones. If fact, the Turbot, and another I have that are stand up are actually designed better for easier placement and are less picky about location.
Just go to amazon and sort by rating, then look at reviews. Tons of good options.