Wise idea to remove the 6700 & 5820XL from your list, but as I pointed out the MS-2 & MS-4 really aren’t that good quality-wise, in addition to being extremely limited in terms of capabilities, so you really should shoot for the MS-10UD-7 (or one of Pineapple’s suggestions) instead in my opinion (since then you should have a decent amount of zones, NACs, & filtered power to do things with, including if you want to expand your setup beyond say a single pull station & a single notification appliance).
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