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I have owned a couple different apeks regs and currently use a XTX 200 with the FSR first stage. I love it, in fact over the weekend I had in water that was 42f at 60ft and as usual flawless performance. That being said you could save some money by going with the XTX 100. I can not find any difference in the two except the finish on the first stage. Also look into HOG regs, I have never tried them, but have heard nothing but good things about them. As for the SP regs a lot of guys like them, I have never used one so I can't give a opinion on them. Good luck, and let the debate begin.
Moving on... A700 and XTX200 are second stages (the part you stick in your mouth). They're usually paired in retail packaging with (respectively) the SP Mk25 and Apeks FSR first stages. The only functional difference between the FSR (XTX200 first stage) and FST (XTX100 first stage) is that the FSR has a replaceable valve seat. The Apeks XTX200 & XTX100 second stages are indentical apart from the bling
My tec rig uses MK25/A700, they have been down to 200'. My best friend's rig uses MK17/A700; while we both swear by our regs, they each have their pros and cons. The MK17 is environmental sealed diaphragm, while the MK25 is balanced piston, non-sealed.