I'm looking for a decent endurance or touring type drop bar bike. I want to do a tour. I also want my bike to be a good commuter and everyday rider. I have absolutely no intention of racing or much of anything involving speed. More interested in miles. I have myself somewhat locked into Tiagra at a minimum and 105 at best. Is this really necessary? I know the lower I go, the less crisp the shifting will be. A local dealer told me I wouldn't notice much difference between Sora and Tiagra, but that I would from Sora to 105. I thought Tiagra was essentially the same thing as 105, with 105 being a cleaner and prettier look. Would Sora or Claris suffice for a budget bike? How much more often will the budget Claris or Sora go out of adjustment as compared to Tiagra/105? THANKS
Keep in mind that all components are easily replaceable. Over time, you will wear them out or they will break at some point.
Recommendation - buy the middle of the pack parts for best value, upgrade later if the performance doesn't match your expectations/needs. Spend more time riding and figuring out what works for you than worrying about the pieces. For the type of riding you've described, properly setup components of any price range will make little to no difference.
Enjoy the ride,