Steve, we do a similar show, you and I, but I found that standing helps my vocal ease, and looks better in situations where there is not an actual stage ... which is A LOT of my venues. I no longer need to carry 2 guitars, since putting an (LR Baggs) piezo bridge in my Strat. The thinner body makes it very comfy to hold, even while standing at the KB. When I do the dueling piano thing, we both sit, and it's ok for a night, but my regular comfort zone is up on all 2s!