in reply to Target version: 5.00x or 5.6.x?

I'm not to keen on upgrading the live boxen to 5.6.1, since I would have to reinstall a fair amount of modules, and hence a lot of testing.

Upgrades aren't fun, but staying behind the times means taking on a technical debt that grows as more and more stuff requires 5.6 or later. Soon you'll be the old guy down the street who still has a rotary phone. Don't let that happen. Upgrade. You'll be glad you did.