batterie capacity question

I order a Neu 1515 2.5d for my MBX5T and i'am to order a 6s pack. I've think to the Flightpower EVO25, 5000mAh, 6s, but it's very heavy weight, 799g.
The only thing i'll do with my truck will be race at the track, and i'll run only 5-6 min at the time, and i'll recharge the pack after every run.
So my question is, did you take a 5000mAh, or a lighter 3700mAh or 4300mAh????

I know on the 3700mAh, the continuous current is less than on the 5000, but is that 92.5A constent on the 3700mAh will be enough for my truggy?