In regards to PSQ - what they don't include is all the additional insulation costs etc. We added about 15% to our original PSQ quoted price. It quickly adds up with selections, site costs etc.
We only had two render colours - domino for the shadow clad and silkwort for the render colour. It's come up really nicely. You can ask TA for some addresses for completed houses (or at least render complete) in your facade to see different colour finished as that might help . I found it hard sometimes to visualise until you see it in real life.