I'd second Leroys post. The Mamba Maxx 5700 would be dynamite on 3s Li-Po's and has excellent programmability. 60+ should open a can of whoop-ass (can I say that?) on the Nitro boys.

Ok

So if I get the mamba 5700 I should be good to go. Do they make the correct gearing for the xl-5 rustler? The guy at my lhs didn't think I could get that many different gear sets. Also since I'm fairly new to all this, will the mamba kit run off normal batts if need be instead of lipos all the time.

Thanks for the input guys

Yes, they run off Nicad's and NiMh as well. If you avoid lipo for now buy the IB or GP batteries in the highest capacity they offer (3700-4200 MAH). They should be assembled with battery bars in the side-by-side configuration with Deans connectors (or equivalent connector) for hi-amp capacity and low loss. 7 or 8 cell would be best but would still fall short of the 3s lipo.

regarding the gears, don't worry as much about the spur gear the traxxas offering will probably be ok.

The key is finding a good spur gear to work with your combo. Mike offers numerous options and since the 5700 use 3.2mm/1/8" shafts you should have many options even at you local hobby shop.

Visit Brian G's calculator for help with gear selection (others here will chime in too I'm sure.)

http://www.scriptasylum.com/rc_speed.html

So far no lawers to soak up any money and yes 2 boys 5 and 7. They both love my truck and want thier own. We have already divided up proporty and time with the boys. Just waiting on the judge to sign the paperwork.

It's really tough when children are involved. I've seen the challenges they face thru my step-son and thru my buddy's son as well.

I wish you all the best for yourself and your boys.