I am looking to put a secondary, lightweight optic on my AR which is set up with a Burris 3-9x scope for longer range shooting. I am thinking of using something like a Burris Fastfire on a 45 degree Daniel Defense mount. Also considering the Vortex SPARC. I am looking for input on this idea. An AimPoint T-1 would be nice but I am trying to keep the cost down around $200 for the optics and less than $100 for the mount. Thanks.