So what is the best offset wheels to run?

I have 3 different sets of wheels that all came with the car:

1 set welds are the lightest around 12lbs
1 set of no names heavy
1 set of no names heavier

Looking to pick up a set of 6 that are all the same, somewhere in the 11-12 lb range, just wanted to see what everyone is running. I run spacers currently with all of the wheels, there are a set of 6 used welds out there from a EP Rx7 with a 4" backspace, will they work with spacers or should I stay away