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Plan your battery weight under 660g iMO.. I love my 8ight buggy, I am using the tekno v3 kit (got it at amainhobbies though cheaper) but impaktrc.com does sell as well. I have yet to break anything other than my rear wing after months of racing... very durable, very fast and most important very easy to find parts if needed.

I am running the MMM v3 & medusa v2 60mm 2000kv motor and get ~20 minutes on my 4s 5k packs at my local track running a 15t bell. This is about 34mph top end but it is SOO quick I really don't loose any ground on the back stretch, but you have to decide more top end or longer run time ;P We have so many jumps any faster just isn't necessary to have top lap times. I would say if I were geared 13t on a 5s 5k would get me pretty close to 30min but.. this is also a ton of stress on the lipo packs going that low in mAH. You will be forced to pit anyway in 30min mains so why not just do 1 battery swap.

PS plan on getting at least 3 lipo's as well so you can get through your qualifiers and mains.. and watch out if you get stuck in a "B" main you may need a 4th battery on hand depending on how quickly they run the "A" Main for the night.

Typical race night for me was
1) run a pack for practice, toss it on the charger (takes ~1hr to charge packs to 97% capacity)
2) run a pack (same pack) for each of the two 5min qualifiers (toss on charger when the first pack is complete)
3) If in b-main run pack (throw aside to charge at home)
4) Run two packs in any a-mains over 17min (Sunday events and proseries are the only A's that typically hit 30+minutes and will pit 1x to swap)