I have a MMax ($140) and a 8xl ($90) and its a good setup, but don't go over 14 cells. I don't know that I'd recc it to a total noob, as you have to be somewhat careful when setting it up. But assuming you are only are only a brushless n00b and not a total Rc/electronics n00b:
You will have to get an external BEC ($15-$40) and disable the one onboard (just pull pin from center wire on plug to esc.) A small fan may be needed in the hot summer months, but for now its certainly ok. No matter what, you prob want to get a small temp gun (~$25) to monitor temps to make sure you have a good setup and proper gearing. I liek to keep ESC temps below 150F, but some are more liberal. My esc stayed below 130F in ~90F weather. Yuo should be able to do ~40 mph assumming you have (14) good cells and your truck isn't really heavy (under 12lbs or so.) Running 14 cells voids the MMax warr, but its pretty safe and the reapir fee is only $50.
Here's a quick vid I did to show the performance:
http://www.youtube.com/watch?v=tkm3w-Z-Nmg Wanted better camera angles, but you get the idea.
The nitro guys at the LHS were very impressed w/ the performance. Mostly "holy #$%#" and "Jesus, that's fast"