I have tried the Sultan 80 and the Salomon Lord a few weeks ago. Both on one or two runs, so no extensive testing, but enough to get the feel. Before going on I have to say my built is different from yours, about 80-90 lbs and a foot different to be exact. I did try longer skies ofcourse (Sultan 178, Lord 184) to compensate some of that. I am about a level 5-6 skier, some good days level 7 (being dutch I don't have so much time on the mountain). Conditions were a little bit mixed, soms snow, some hardpack and quite some crud.
Having said that, now for my opinion (I know the 4800 only by name btw):
The first thing is that they are very different. The sultan is basically a very comfortable on-piste ski with some extra mm underfoot added. The felt a lot like the Dynastar booster 12 thanks to a similar composite core. It is easy to ski and light (which probably fits your profile quite well). I have nog tried it offpiste but I don't think it is very good allmountain. As an easy allconditionski it does stand out, only slightly behind the atomic nomad blackeyes imho. The ski handles crud primarily by being very forgiving, you will feel the hump but won't be thrown off.
The Salomon is a much more 'modern' ski. The tip and tail are more rockered (yes, I know this is a bit of a markeringterm, but you know what I mean). As a result it feels much more allmountain and will float over the snow much more that go through it. The ski is very easy to turn (even pivot) and is very damp. With some technique it can be carved reasonably, but you don't really have to do this. It was fun to ski, but being a little more piste-orientated I missed some of the typical feel.
In conclusion I would base my choice on the kind of feeling you like and the amount of real offpiste skiing you will do. Both skies will not dissapoint you if you don't want to be too aggressive.
[The sultan 85 btw is more serious than the 80 thanks to the woodcore. If you want to keep keeping up a long time they are a nice choice, but do test them.]