i reckon the burton snowboard bags are the best. im on my second one now (my first one didn't have wheels....stupid decision to buy it) and i love it. snowboard bags are a bit wider than normal ski bags but you just have to make sure you get the right length for your skis. there are a few different ways to stack skis in them. i like to put one pair flat down, side by side (with the brakes held up in place by an elastic band or cable tie) then load in all my stuff using the two clip in bags that come with the big bag then the other pair of skis go upside down on top of all the gear. that way the only space you really lose is the binding space, which is a hell of a lot better than pairing the skis up and putting them in sideways.
Look into the armada anchorage ski bag. Its what I have and I love it. Fits two pair and all kinds of outerwear. Watch out though, I got taxed by the airline because it was overweight, I put too much into it!