All other things being equal, light is better. But things are never equal.
I am a believer in light equipment. I personally prefer my Full Tilt boots, light Marker bindings and Goode Carbon skis. In powder, I break out my Praxis Backcountry skis. All very light both in weight and feel. But I also own Volkl Race Tiger SL skis with the integrated bindings. A rather heavy weight to carry to the lifts but a very light feel on the snow.
I have had skis feel too light on the snow. I've also had some fairly light weighing skis that felt skied like they were made of lead (my old K2 KVCs were the worst). And I've really enjoyed riding some heavy (in weight and feel) skis. You really need to demo to see what you like.
I must point out the compromises I accept with light equipment. I don't ski fast which is nice because my light feeling skis aren't that comfortable when going fast. I have trouble making pretty long radius carving turns (the mogul fields I prefer discourage this as much as my ski choice). And I hate ice (does the ski have anything to do with that?). Finally, I lose lots of GNAR points throwing twisters off every little jump.
Ghost listed a few really valid reasons for light equipment. Enough to convince me that weight really matters! As long as you like the ski's feel. Marznc's idea of light bindings on the ski you like does save a lot of weight without compromising performance (who really needs 13 DIN bindings on blues and easy blacks?). And demoing equipment for a trip out of your region makes so much sense - plus it's really fun to try different skis.
@berbes I haven't skied any of your selected equipment despite an appetite for light stuff. I can't offer specific advice on your choices. Weight is just one factor to consider when buying skis. I would make sure the boots are comfortable with a flex pattern you like (as well as light). I would be very hesitant to take untried skis on the "trip of a lifetime" - demo skis on the trip from the local shops who know the good choices for their mountain (and buy what you liked best?). On the other hand, if you are getting a deal on the package, go for it! Just be willing to rent if the equipment doesn't suit you or the conditions.