The N7 labeled weapons with the black label are the UR right? Hmmm, I got like 3 of those already from SP and I didn't buy a whole lot. Is PSP better for characters? I still want the Ghost and the Kroguard
SPs are good for giving you more consumable items (and, if you need them still, uncommon gear/mods/etc.), at the cost of 20k more per guaranteed rare unlock. Reinforcement packs are good for getting you more Volus character cards and maybe a Guerrilla Upgrade on occasion.