Logo 400 Batts 5S or 6S

[Mr Nice Guy]

I am now trying to figure out what Batts I should use when I get my 400. I plan on getting the 400 w/power system (hacker A40-12S) So far I'm looking at the Xcite 3000MAH for 6S http://www.xcitebattery.com/newfrontpage222V.htm or their 4100MAH for 5S http://www.xcitebattery.com/newfrontpage185V.htm What do you guys think of this? Are these decent batteries? Should I go 5 or 6S? I'm not doing any 3D yet as I'm still getting the hang of normal flight but want to be able to do some aerobatics and eventually some 3D stuff. I have read some good reviews on these batts so far and no negatives, plus they seem to have a good warranty. If they suck what are some alternatives that aren't uber expensive? Thanks again guys.