New Spawn

[justplainnuts]

Hello all. Just got myself a new wraith spawn Saturday. Love it.....My first crawler. I have had a slash 4x4 for about 3 months now and have a lot of knowledge on it, however the wraith is strange to me. I have read that a lot of you have added a BEC to your unit. Will I need this, plan on mostly running 2S batteries. On that note does a 3S make a difference?
Another internal conflict I am having....I have a CC Sidewinder 3 I plan on putting into the wraith. Which engine (brushed) would be the best...leaning towards a Holmes Hobbies. I will mostly be crawling and chasing dog around backyard, don't need much speed, have my slash for that.
My last question and I will be off. Today while tooling around with the wraith, the servo seemed to not turn, to one side. Could that be the arm stripped? or the servo itself, I tightened the screw in it, was a little loose. Seems to be okay now. Is the Tactic servo a good servo in the wraith, or should I replace?
Thanks for any help and suggestions you can supply.