losi 8ight-t lipo questions

[hootie7159]

Just a quick question to all the brushless experts on this forum....i waas wondering which lipos should I get for this setup:
Losi 8ight-t
Neu 1515 1y/f
MM w/ CC BEC and fan

I was thinking of getting a truerc 4s 8000mah pack or a neu energy 4s 5000mah pack....i've read somewhere on these forums that both of these batteries would perform at the same level and would offer the same performance...what would you guys use?