As far as batts. go I would go for the 30c version of the ones you were looking at...I am running the 5s 30c version and love them and you can't beat the price. The mount I used is this one..
http://www3.towerhobbies.com/cgi-bin...?&I=LXVEC2&P=7. I actually bought the mount for another project, but never used it and remembered I had it and it worked great for this truggy. just need to drill 3 holes and you are done.
Deans are widely used and work great.
1. MBX-6 T8 1900KV, RX8 ON 4S
2. MBX-5T 1520, MMM ON 5S
3. MBX-5 ONROAD CONVERSION 1515, MMM ON 5S
4. MRX-3 ON ROAD CONVERSION 1512, MMM ON 6S
5. TEN T 2650 T8, MMP ON 3S