well the front and rear's arrived and ive now decided i want it to be an all out racer and im goin to go with lipo's, which ones should i go with? for a 9920/9XL

What about 16 cells? It would fit perfectly across the battery slots, but then again, the cutouts are off so the cells dont actually drop in! I notice that when I did a test fit, I guess I'll be using some extra zip ties or straps to secure (I got a CF one).

Anyways, Most people here run LT Springs (not the rockers though). Also, the weight distribution is different on the G2R, you will find you need a stiffer front spring than normal. Usually you use a rear springs thats 2 steps up from the front, but with a G2R, you should use a rear thats just 1 step up from front, or even two of the same springs.

I am running a 7xl with a Quark 125 and it gets very hot very quickly. The 7xl is hotter than the 9 or 10 but you will still need a fan or heat sink or in my case both if you are going to race it. The Quark is a very nice smooth as butter controller but the case just doesnt dissapate enough heat (no fins?)to keep it cool. If you are just bashing or running 5 minute heats you can get away with it, maybe.
If you use Lipos it will add even more heat (high amps 60-80 vs 30-40 for nihm)

Aside from the heat of the Quark, how do you like it? Does it program ok? Can you program by pc or just by the button? Does the reverse function ok? I'd really like to get an honest opinion before I buy. I'm looking for EVX behavior but with a brushless system.

IMO: The Quark is a nice controller, but if you're not ready to play with heat issues, than I'd go 12020 or 9920 should work fine too. They are easy to cool, and if you have a nice radio, you can get them to be more responsive than normal(BK's). But the quark has better funtionality and is smoother, reverse is good in it, just need to program it correctly for what you want to run.

It sounds like if you take the time to set it up correctly and to address the heat dissapation issues that the Quark is a winner. I can do that.
I'm also wondering what the specs might be like with the upcoming monster mamba maxx system. I like the pc interface and programmability of the mamba maxx. The adjustable throttle profile among other things seems like a benefit.

Limited on programming, but you can program the throttle on the BK's too.

What kind of radio would make the BK's more responsive? I have a Futaba 3PDF currently.

I run a M8 and can get it pretty controllable. You need something were you can turn down the throttle EPA and brakes.

I run the JR XS3 or something like that, and i adjusted the epa's and epx's. now it's real responsive to the touch. Most FM aftermarkets should have these as well.
Squee, turn down epa?

Yea, I sometimes turn down the throttle EPA (end point adjustment) so the top speed is less depending on what I'm doing. On my M8 I can adjust the throttle EXP, EPA, and Speed. I have yet to try and adjust the Speed. It's mainly for a throttle servo, but I think it might slow down the throttle on the ESC as well.

turn it down, are you crazy? I turned my up a tad, and then adjusted the nuetral position on the epx settings to get rid of the dead air....works great! alos adjusted the epx on the steering to make is more responsive as well. LOL, i had the steering to 100, thing would turn way toooo fast and I rolled my truck cuz i wasn't used to it! So i turned it down and it's reall touchy, but manageable!

Good advice! I'm hoping to order the esc, ubec, and 9xl or XLT4 motor in mid-August so I'm trying to get it sorted out in advance. I hate spending money twice...know what I mean?

Yep, been there doing that! LOL

Usually the only time I turn it down is when I turn it over to my dad :p.