For the OP, I would do the regular SP01 over the tactical decock model. I think it is generally regarded as having a potentially better trigger...easier to work on....better resale....lots of parts, etc. Limited minor is a nice place to start, mainly because of the lack of constant reloading. You could shoot that for a while and if you really like limited, get a .40 and get the SP01 milled for a red dot for your CO aspirations.
For Vinny. Although I shoot P09s in matches almost exclusively, I think the regular SP01 is a probably better choice for competition. If I really wanted a decocker however, I would choose a P09 over a SP01 tactical. I like the position/direction of the decock lever more and the simplicity of the mechanism.