Advise please online store with comfortable and beautiful wizzard to assemble components

Advise please online store with comfortable (logical works and gives tips) and beautiful (imageable already assembled system unit) assistant (step by step wizzard) on the compilation of components for the PC. Interested logic operation, the system prompts and visualization method. Thanks in advance.
 
Or you could just look at a prebuilt system on any PC parts website and order those parts individually and build it yourself. Just as effective.
 
Back