Nero - TX vs XII + jammer sizing?

So, with the scary-fast Santa Clara psych sheets up, I'm contemplating violating my "never pay more than $100 for a jammer" rule. I'm not yet willing to go above $200 and blueseventy has always had a special place in my swimmer's heart thanks to their awesome Nero Comp from the glory days of the bodysuit era, so I'm really just down to deciding: Nero TX or Nero XII? Which size? Any strong opinions or biases on which suit is better? If you prefer one, why? As for size, I typically train in an 32 Endurance jammer, but race in a size 30 TYR Tracer Light. Any experience whether the Nero TX or XII are "sized right?" While I'm at it, I'm also in the market for a new speed cap and soliciting recommendations from others who have large heads!