[pilleya]

If your using Talon SR’s are they are working well for you there isn’t necessarily a need to change (providing you have a decent stockpile that will last you a few more seasons).

The SPARK and the SD540B’s aresimilar to the Talon SR both in design and functionality if you need more controllers they could be a good option due to their low cost (SPARK is the better option of the two), but if you already have a lot of SR’s then moving to SPARK’s or SD540B’s may not be a necessary upgrade( unless you want features like the limit switch inputs on the SPARK etc.)

In regards to the Victor SP vs Talon SRX, it really just depends on whether you want to move to CAN or want to continue using PWM.

If you are planning to continue using PWM staying with your existing SR’s would probably be fine, if you want to make the move to CAN (it’s not difficult and has a lot of advantages) the Talon SRX is the only option that can be bought new off the shelf (at the moment).