Yes I'm using three of those brackets. I don't recommend anything I haven't used with success. One 1501mg servo has 15 pounds of torque. Its probably 3 times stronger than the original gearbox.

so one or 2 of those analog servos for the body tilt? could I get away with 1?

And you say that lipo batteries are good for this?

Yes you can use just one for body tilt. Just replace the current gearbox with it. I just have a symmetrical obsession , one servo will be enough to hold your body upright and do "some" lifting. The standard servos should be fine for your neck because the head doesn't way but a few ounces and so does the EZ-Cam. Lipo batteries are seriously the best kind of battery and are worth the money. They aren't but a few dollars more than a quality/ new sealed lead acid battery now.

Ive always put my trust in ni-mh batteries. ill look into the lipo's.

How hard do you think it would be to make a mounting bracket for the head turn/horizontal servo in the head? Could you use 2 heavy duty servos from the shop in the body tilt?

No really need for a bracket , there's already and insert there you can cut a hole the shape of a servo out and hot glue or screw the head to. So if you only want side to side movement you don't need a tilt bracket.

would I need 2 of the heavy duty servos in the shop for body tilt? I want to try to keep all the things I need together to save on shipping.

If you go with the ones in eZ robot store then yes two of them. I can show you how to modify them to move in sync as one servo. Together two should have a combined strength of around 260 oz in at 6 volts

ok. what I was thinking for powering the robot is: 8.4V ni-mh battery. I think its 10000 mah. will this be enough to power 2 hBridges, and the ez-b? the heavy duty servos will be powered with the battery pack that comes with the ez-b.