I've running Lipo since last fall and have been very happy with the ProTech (Amain Brand) stuff. I would reccomend running a regulator regaurdless of what your servos can "handle". I just run my regulator between the switch and receiver. You can put the regulator in the batty box or if the box is tight like the on the 8 your can mount the regulator on the top of the receiver box. This is better becuase you can see the LED lights.
Here's the Regulator:
http://www.amainhobbies.com/product_...ducts_id/13509
Here's the battery: (They have a couple of different styles, this is the one I run)
http://www.amainhobbies.com/product_...ducts_id/13508
As for the Charger I would get a good balancing charger that charges throught the balancing plug. There is one made by Tenergy that does this, it also gives you the individual voltages of each cell. You may also see this charger co-branded by Common Sense RC.. A friend of mine has this charger and it will be my next investment.... Here's a link you may also find it cheaper at other stores, occasionally I've seen it on Ebay too:
http://www.all-battery.com/index.asp...OD&ProdID=1644