Replying to Twin Tip Help

I know there are about 10000 of these threads but i need some help on my next ski that im going to buy for our (Aust + NZ) winter this year.

I currently have the 06/07 182cm Public Enemies, but i dont have very strong legs and i find they are real heavy, and even slightly too long for me (im about 183cm tall (6 foot)).

I spend most of my time doing big mountain stuff, but i still want a twin tip for messing around etc as i dont take my skiing super serious.

and i thought i would buy a pair from over in the US over the internet to save a bit of $$$ when the season finishes.

So what would you recommend on being a good LIGHT twin tip?

Also, what are some good internet sites to purchase over? and what would be the best time to purchase.

THANKs!