whats better?

ok since its tax refund time, what would be better for me should i order the sct chip with there mail order tune and when i get cams/heads/manifold take it to the dyno, or should i go with the sct xcal2 tuner. ive heard that the tuners are more for people with no access to a dyno. if this is true should i just get a chip since i have access to a dyno.
 
well then since y'all recommend it i cant go wrong with a tuner. so these mail order tunes are pretty safe then? what i would like to do is just use the mail tune until late this summer when i plan on doing a manifold/ cam swap, then taking it to the dyno. sound like a good idea.