i've always had good times with volkl. also spent a lot of time with some blizzards.
my volkl slalom skis were 165's and they could be super fun!
165 cms for a slalom ski would probably be the best size for you!
in my opinion, you probably won't want to buy some downhill skis. even though you're a little bigger, they can still be pretty hard to turn. but if you can find a VERY wide run with no people on it at all, then give'r.
If you want something fun to carve around on, maybe some GS skis are the way to go.
My volkl GS skis were about 184 cms or something i think. my blizzards were about the same. i found that blizzards and volkls were very much like sister skis. quite similar.
also, have you considered a Super G ski? that would be better than a Downhill ski for your purposes.
and note: i'm 17, 6'1, 150 pounds and fairly advanced (10 years of racing experience).