If i want a nice light show, i make it a nice light show, putting weight and all aside.
At 30lbs your employees are struggleing? hehe
Im not saying youve made a bad choice to go with the XP3s, afterall $$$ does matter. I think i would prefer 2 autospots over 4 XP3s. They are both great, but the autospot is simply better.
For the price, adding more scanners might be cool too. Just be careful not to over power and wash out any of your existing lights.
My personal opinion.