I had a Fuji newest Aluminum w/ all 105, nice bike for about 100 miles then had to return it due to my heel constantly hitting the chainstay. Low end usually refers to both frame and components. The Newest I had would be considered low end range of the Fuji line.................although, Shimano 105 is not cheap stuff, very good in fact. Alot of people I ride with have 105 spec'd out on their carbon fiber race bikes.
I have 9 bikes (soon 2 b 10) and ride 90% SRAM mostly Force which I consider the best quality race ready componentry out there.