I have owned two Funtana 40's and they will come in at 6 lbs with the Saito 72. It will NOT be enough power to 3D unless you like buying 30% heli. A guy at my club had one with a Saito 72 and was not happy. I had one with a YS 63 and it was just enough power to 3D using 30% heli.
For a Saito 72 you will need the plane to come in at 5 lbs no more or you will be dissappointed in the power to weight ratio. Now if you had a Saito 82 it would be a totally different story, Then you could go up to 6 pounds max.
ORIGINAL: Fletch124
For your Saito 72 there are quite a few options. You could go with a Funtana 40, a profile from Accelhobby, Ultra-rc's Yak-54 or Katana, those are just a few that came off the top of my head. If you search around you can find ALOT more!