what am i looking for and where can i find it? i already have the sneak suit

Is it upgraded all the way by doing repeated runs thru the course?

Do you have the cyberdog gun or the (arguably) upgraded version FIDO?

There's also the jury rigged tesla cannon and the LAER.

Check out the http://fallout.wikia.com/wiki/Fallout_Wiki .

Here are two, easy to find. I always go straight for them on a new play through:
Christine's sniper rifle is on the upper level of a burned out building near Little Yangtze.
Her recon armor is in the medical facility where she was taken.