Do you have a schedule of AoR's? If not, then $150 is $150 so go for it.
If you do have an AoR coming up, you might want to consider how much a hard pull is worth to you. Most sign-up bonuses chased on FT are worth far more than $150 so if you're trying to make room for this $150 bonus in your 6-8 card AoR, I'd say forget it.