Those 3010's won't use up much more than a standard servo. I use them in place of 3004's because they have more torque and seem to like the 5cell batteries better. I can get 3 to 4 10 min flights with a 600mah nicd on several of my 3010 equipped planes.
Best bang for the buck is a NimH 2700 or another Nicd if you prefer. I get all my rx and tx batteries from fellow RCU member Evan at his website RC Assesories. For example here's a 4.8 , 2700mah NiMh for the same price your paying for the 1500.
[link=http://www.rcaccessory.com/index.asp?PageAction=VIEWPROD&ProdID=24]RC Assesories, 4.8 2700mah, nimh[/link]