I would get the stock Traxxas shocks and put on the Traxxas aluminum shock cap. The Traxxas GTR shocks, and big bore shock are good as well. If you want to try something different here is some cheap Hobby Park shocks.

Hobbypark 4PCS Aluminum Front Rear Shock Absorber Assembled for 1/10 Traxxas Slash 4x4 4WD Slash 2WD Upgrade Parts,Replace 5862 https://www.amazon.com/dp/B071ZC8JGP/ref=cm_sw_r_cp_api_i_YGR7RG76M2BCY888NQ64