The Ritchey isn't the easiest to adjust and needs some serious leverage to keep the saddle in place, but if you're a 'set-and-forget' type of person, it'll be fine. Hardly a deal breaker.

The Thomsons are also a good choice - just don't get a straight one unless your bike is specifically designed for it.

Just get the one you like the look of the best would be my suggestion.