Free: Contests & Raffles.
You want cool factor get a turbo or a supercharger. One guy I know has a supercharger on his 4.0 in his TJ and it is a lot of fun.
You'll be amazed at the torque increase with a stroker. I'm gettting new motor mounts cause mine torque steers now when u get on it. I mulled around about an LS swap but the expense of basically a whole new drive train wasn't in the budget at the time.
Buddy if mine has had a stroke 4.0, and a supercharged 4.0.Both were awesome! I'd go with a stroker over the forced induction, just to keep it that much simpler.