Taser - x26. Safariland make nice cross draw belt holster for the small X26. Pretty handy, and keeps it out of the way.
baton - don't get the light weight 'air weight' ones... less weight seems like a good idea at the time you are buying one. But no mass, you just can't actually hurt anyone with one when you really really really need to.
OC - we use the PUNCH II M-3s. Splatter stream pattern. They are the small 2 oz size, one application and even if you don't use it all, you toss the can and get a new one. Rather than breaking the seal and carrying a 1/2 can around.
We recently switched to water based propellant after an agency in the area OCed a guy and then tasered him and then continued to OC him while the shock was on... produced a small flame from the propellant. Didn't light the guy on fire or anything, but it was enough to get all the agencies attention. However, depending on how you will will be using it and what considerations you will have to take, the alcohol based propellant will work better as the propellant will open the pours and let the goodness in.
Also, the first batch of water based propellant cans we had were a little dodgy... like, no pressure and they wouldn't fire. got new ones from the manufacturer and they haven't been any problems since, but I am still suspect.
Like Joe said, you know what SHUs are? Look for that rating on OC. The percentages don't mean dookie... just marketing mumbo jumbo. Look at the SHU measurement and then compute the ppm/volume ratio of 'hotness'.