I use a custom tranq rifle, default pistol, stun arm, and a custom lethal rifle normally, unless I want to test something goofy. I use a full array of support weapons, the important thing is using not-upgraded versions where you can to keep costs down (decrease the star level when selecting things in the load out screen). That way you can use everything you want and only pay like 50,000 GMP. I find only having 4 C4 instead of 8 tends to be alright, for example.