I dont have a bridgeport, I have a chinese clone, but I am in the same situation. If your machine is R8 spindle taper like mine, I found probably the 2 best options.
If you care about fixed tool offsets then I would look into
http://www.mach-1tooling.com. these kits are a factory option from bridgeport but are pricey. $1500 for a full kit.
If you dont care about fixed offsets then I would just get a powered drawbar, about $700 for the kit.
I'm leaning toward the mach1 kit even though it is expensive because I converted to CNC and fixed tool offsets would make all operations super easy.
hope this helps, Vince