I just hit CR 70 and was able to do my first Gates run last night. I was surprised at the amount of marks I collected, and so I'm sitting on an interesting choice. I still have a couple Level 64 pieces, and could upgrade both of those to Level 70 pieces (Tier 3?), but I also could save the marks and upgrade one of them pretty soon to a Level 78 piece (Tier4? - Sorry if I have the tiers wrong). Which is better? I play casually and level slowly, so marks are slow to come for me, so I'm just trying to think through how best to upgrade as I go from CR 70 to CR 84. I'm not in a particular rush, but don't want to spend the marks on Tier 3 if it doesn't make sense. Thanks for any advice.