Do you consider this to be a good base

for "suffix cannot be changed" type of crafting ? ilvl 84

No, because prefixes are more important in this scenario. You can't really get away with low energy shield rolls while a res roll can be "fixed" with a ring or shield or maybe even a jewel. You would need so many Exalteds to get a proper ES roll on that item.
Also fire res isn't even a T2 roll.

it's not bad if you wanted a life helmet. going to be really hard to get double es + craft

thanks for the input. yes you are right, the low life variant is out of question, the average craft cost would be too high, but it could be fine for life variant, and some RF people might struggle with resists so they could be fine with low life roll (or can try to exalt good one). Im looking for some profit here, need some currency for my next build and managed to got this for relative cheap (50c + one horror essence)