I have been using some vintage NOS Berg 14/16 db spokes for most of my recent builds since I have a crap load of them at the shop... they are of very good quality.
I usually build 36 and 40 3x or 4x wheels most of the time as my customers tend to be utilitarian riders and tourers and after having a bunch of wheels go out on some insanely long rides this year I can say I am pretty pleased at how well they all held up under some extreme use and load.
A 32 3x track wheel is going to be plenty strong if it is built up with a Velocity Deep V, a good hub, and decent spokes... and if the build is done right.
If your derailer is hitting the spokes there is something wrong with the bike... it could be a bent hangar or a bent derailer causing the problem or the rear d might just be set up wrong.