I don't know how big of a cage you should get.
the day I was told was about the as yours but I have a veil cham.
When she is scared or stressed out she will change to a darker color.
I use a ceramic heat lamp and it works the same way as the basking lamp but I keep that on all the time.
Well brad answered it all but you might also try letting the crickets roam free to give him the excercise invovled in catching the crickets. I have a veil cham to and notice that he has a really big appetite. So it just depends.
They covered most of it but hieka I have only heard of veil chams living to be 7 years. I rather like the 10 years better though because I also have veil. Oh and the animals you listed like the moths and stuff can be eaten.