I traded "down" from a 1200GS to an 800GSA, as I wanted something lighter and cheaper. I don't need a bike that retails at £15k new.
Smaller engine seems to also mean physically smaller bike, which is the last thing I need if I want to avoid feeling as if I'm riding a child's bicycle. The Versys 650 is relatively tall (840mm seat height) and gets brilliant reviews. I am tempted, but once the initial novelty of a new (to me) bike has worn off, will I be left wishing I'd gone bigger?