Need help w/ Savage conversion.

[TIMN]

Hi guys, been readin' like crazy, tryin to find out exactly what to go w/. I have a 90% aluminum Savage w/ Big Joes on it, that I want to electric. So far I've been reading the 7XL and 9920 w/ dual 7 packs would be nice. I want to plan for the future though, and get the fastest/strongest motor I can. I plan on adding Lipos down the road, so want to be able to handle extra power when I get there. For now want to use most cells I can carry. I need a reccomendation on where to buy the conversion kit, and will be will ing to buy motor and esc from here to support site, or anything else you can sell me to. Just wanna know the biggest, baddest, fastest set-up I can go w/. Lastly I was wondering if the Hacker 50 XL would be a good motor choice, as I might have a line on a slightly used one, or would consider new if I missed out on it. Thanks in advance for any and all recco's!!